The UDMC® Pneumatic Valve and Rod (PVAR) System
(Patent Numbers 1-2009-000176 and 1-2011-000062.)
The UDMC® Pneumatic Valve and Rod (PVAR) System
(Patent Numbers 1-2009-000176 and 1-2011-000062.)
Conventional or standard parts such as the gas block, gas tube, handguard, bolt assembly, the bolt carrier, polymer handguard and barrel lock, among others, were replaced with UDMC’s proprietary patented Pneumatic Valve and Rod (PVAR) System. Specifically, instead of the hollow gas key, it was replaced with a one piece bolt carrier with a solid “punch key” where the piston rod communicates or transfers the mechanical energy by pushing the bolt carrier rearwards for a much more reliable cycling.
The UDMC PVAR System executes the replacement of the operating assembly of the conventional AR, M16, M4 and similar rifles. Where in the Direct Gas Impingement System gas is used throughout the operating cycle, the UDMC PVAR System utilizes instead mechanical energy for a more effective and more reliable cycling.
The UDMC PVAR System prevents much of the heat, carbon build-up, unburned powder, and dirt from being deposited inside the bolt assembly and the bolt carrier group resulting to a cleaner and cooler operation, less downtime for cleaning and repair and, considerably longer life span of the rifle.
Reduced Field Maintenance
The PVAR system eliminates the constant cleaning requirements of the AR, M16, M4 and similar rifles in the field. Where the conventional design requires general cleaning of the operating parts every so often, the PVAR rifle requires minimal cleaning (or just check-up) of up to 2,000 rounds, certainly much more volume of fire in between cleanings if compared with conventional direct gas-operated rifles. The PVAR valve, piston rod and spring can be removed from the front of the gas block without special tools and without dismantling the whole upper assembly!
Reduced Rate of Fire
The PVAR Rifle has a reduced rate of fire (750 rounds average per minute). This slower rate of fire and the “cancellation” of the excessive rearward pressure (found in DGIS rifle) is eliminated via the PVAR’s forward and backward mechanical movement of the piston rod thus resulting to operating cycle reliability, less recoil, less muzzle rise and excellent firing accuracy of the rifle in the hands of even a newly-recruited light-to-medium framed soldier, regardless if the barrel rifling twist is 1×7, 1X9 or 1×12, and regardless if the ammunition used is 55 grains (M193) or 62 grains (M855).
In other words, the PVAR design has greater flexibility, reliability and accuracy than the conventional gas-tube designs and even in comparison with the other gas-piston generic designs from other countries that are being sold supposedly as “drop-in” kits which, do not function reliably particularly on bursts and full automatic modes, but in which modes the PVAR rifle is guaranteed to perform!
Optimum Flexibility and Improved Accuracy through a Floating Barrel Design
The PVAR rifle was designed with enhanced accuracy in mind through our proprietary (part of the patents) one-piece quadrail handguard with military-specs picatinny rails mounted on a round barrel lock cum handguard mount. The one-piece quadrail handguard enables a true “floating-barrel” that greatly aids in the consistency and accuracy of the fired round since the handguard was designed not to touch any part of the barrel at any point along the barrel’s length except at the barrel extension.
The barrel is mated to the rifle’s upper receiver through the barrel lock which also holds the handguard securely in place such that the barrel now “floats freely” without any contact with other rifle parts other than the rifle’s barrel extension which is securely attached by the barrel lock to the upper receiver near the chamber. This minimizes mechanical pressure, distortion, and vibration throughout the length of the barrel when a round is fired.
Reduced Wear and Tear and Extended Rifle Lifespan
As an option, the PVAR System can use a top railed flat top gas block with mil-specs picatinny rails which houses the valve. UDMC also has the triangle gas block with the front sights mounted on the top of the triangle. With this design, the piston assembly can be taken down from the front of the triangle gas block. In conjunction with the rod and spring, the whole assembly impacts a reinforced bolt carrier assembly where the old design hollow gas key of the DGIS is replaced with a solid key of extremely hardened metal which accommodates the impact of the rod (of the same hardened metal) and strikes it by about ¾ of an inch.
Easier Takedown and Assembly
The PVAR system can be easily removed from the front of the gas block, taken-apart, cleaned, and reassembled in the field in a matter of seconds, unlike the conventional gas-tube and other gas-piston designs which require the removal of the handguard with special tools for proper dismantling and cleaning or replacement of parts and which will take several minutes to dismantle and re-assemble.
Currently, the UDMC Pneumatic Valve and Rod (PVAR) System is available in variants of the M16 and M4 in caliber 5.56 NATO with barrel lengths, from the 7.5 PDW up to the 22 inches sniper model and any length in between. The PVAR rifles are also available in variants of the M110 in caliber 7.62 NATO, from the CSASS length of 14.5 inches up to the sniper model of 25 inches.
Reliability Under Adverse Battle Conditions
The PVAR Rifle has been proven to fire reliably even with sand, mud and water inside its system. A perfect weapon for SEAL and SF operations.
The UDMC® Direct Gas Impinged Mid-Length System
The UDMC® Direct Gas Impinged Mid-Length System
In UDMC’s DGIS Mid-Length System caliber 5.56 NATO, the barrel uses a "mid-length gas tube" of 11.25 inches long. Typically, the standard carbine has a gas tube length of 9.75 inches. This gas tube length of 9.75 inches is the one used for barrels 10.5-inch, 11.5-inch, 14.5-inch up to 16-inches. In the UDMC design, it was decided to lengthen the gas tube, for good reason.
The Mid-Length System uses a mid-length gas tube (11.25 inches) with a “forward” placement of the gas port in the barrel. The drilled gas port is seven (7) inches measured from the tip of the muzzle of the rifle instead of the standard specification of 8.5 inches from the muzzle tip. The effect is that there is less gas pressure being rammed back into the BCG gas key. The DGIS Mid-Length System renders a slightly “softer” shooting AR with slightly less heat flowing back into the bolt and bolt carrier group and other critical parts, key to longer life and a little less maintenance. This system mimics the more efficient and reliable performance of the 20-inch barrel M16A2 while using shorter barrels of 14.5 and 16 inches.
Since UDMC produces its own barrels from cylindrical blanks, it is able to introduce this new S5-DGIS Mid-Length model on 14.5 and 16-inch barrels. Because of this, the gas port can theoretically be drilled in wherever part of the length of the barrel, something that AR assemblers are unable to do.
The DGIS Mid-Length model uses a longer handguard since the standard M4-length handguard is now short. The handguard that is installed is a T6 aluminum “KeyMod” railguard that will float the barrel, a feature that a purist competitive shooter wants as it aids in better accuracy. As another option, the KeyMod railguard can cover or not cover the gas block front sights. If it is preferred that the gas block is inside the railguard, UDMC will install a “low-profile” gas block that will fit inside the railguard. That will also mean a longer railguard to cover the gas block. For the latter design, UDMC will install its own fabricated set of flip-up sights for the front and rear.
Military, NATO-Grade Raw Materials
Military, NATO-Grade Raw Materials
To produce the PVAR rifle and the DGIS Mid-Length rifle, United Defense Manufacturing Corp. uses only the best raw materials to guarantee a “Tier-1” product that meets or exceeds NATO standards. For example, UDMC uses only T6-7075 forgings (aircraft grade) in all its aluminum parts. With UDMC, gas blocks, bolt assemblies, bolts carriers and other steel parts are machined from steel forgings or solid billets rather than from castings in order to guarantee strength and repeatability of dimensions. The small internal parts come from MIM production.
UDMC heat treatment processes are computerized, leaving no room for errors. All major parts are produced from Computerized Numeric Controlled (CNC) milling centers and turning machines with a combination of several processes via 3, 4 and 5-axis CNC’s and, EDM wirecut CNC’s.
Barrels
Barrels
UDMC produces its barrels from cylindrical blanks supplied by Dikar S. Coop BERGARA of Spain whom UDMC represents as distributor in the entire Asia-Pacific Region. The Bergara cylindrical blanks are made from the finest carbon steel and stainless steel, used in the ordnance, aerospace and defence industries. If other suppliers will say that their barrels are SS-416, only a Certificate of Chemical Analysis can determine its quality. UDMC’s AISI 416 Stainless Steel PREMIUM ordnance grade barrel has contents of Vanadium, Nickel and Molybdenum which are not found in a standard AISI 416 stainless steel barrel. The net effect is that the United Defense - Bergara barrels have a yield strength of 780 MPa (versus 275 MPa of std AISI-416 SS) and a tensile strength of 920 MPa (versus 517 MPa of std AISI-416 SS). In terms of toughness, UDMC barrel is 73 Joules versus 34 Joules of the std AISI-416 SS.
The optimum combination of high hardness, yield strength, and tensile strength, along with the correct toughness, allow UDMC barrels to withstand the generated pressures when the rifle is in battery, even with powerful rounds such as the .30 caliber or the .50 caliber precision rifles.
UDMC barrels, compared with other stainless steel barrels in the firearms industry, are very hard steel which increases the mechanical properties of the barrels and it is fair to say that this is one of the best insurances from the safety point of view of a barrel. In addition to this, one of the differences of UDMC barrels is the small grain size of its molecular structure thus guaranteeing excellent toughness. The homogenous microstructure during hardening and tempering provides a uniform hardness along the bar, producing a very uniform rifled bore, which is the key to accuracy of a barrel. The heat treatment, in combination with the precise deep hole drilling, honing and button rifling process results in a uniform finish of the bore under 0.0008 inches. The stress relieving heat treatment on the other hand, after the button rifling process, protects the bore from inside deformation after the tapering of the barrel. It also helps protect the barrel from heat generated after continuously firing several hundreds of rounds.
Finally, the high chromium content of UDMC barrels provides a good corrosion resistance to it.
Warranty and Guaranty
United Defense Manufacturing Corp. is the only true manufacturer of commercial and military grade assault rifles in the Philippines. Unlike foreign brands or other Filipino companies who are mere “assemblers” and not manufacturers, UDMC backs up its products with warranties and guaranties. It is also a commitment that is much more than what foreign brands can offer through their dealers which, if the foreign brand breaks or does not function as claimed, no warranty nor guaranty can be invoked immediately by the customer.
Warranty and Guaranty
United Defense Manufacturing Corp. is the only true manufacturer of commercial and military grade assault rifles in the Philippines. Unlike foreign brands or other Filipino companies who are mere “assemblers” and not manufacturers, UDMC backs up its products with warranties and guaranties. It is also a commitment that is much more than what foreign brands can offer through their dealers which, if the foreign brand breaks or does not function as claimed, no warranty nor guaranty can be invoked immediately by the customer.
Engineers, not Gunsmiths
UDMC staff is composed of engineers and not gunsmiths nor craftsmen in the trade. UDMC’s philosophy is that arms-making must be technology-driven and it can only require exacting designs and dimensions that have repeatability, modularity and safety as it aims for mass production of their products for sale to peace-loving governments and law-abiding citizens. Furthermore, UDMC uses only the best softwares procured from Dassault Systemés of France.
Engineers, not Gunsmiths
UDMC staff is composed of engineers and not gunsmiths nor craftsmen in the trade. UDMC’s philosophy is that arms-making must be technology-driven and it can only require exacting designs and dimensions that have repeatability, modularity and safety as it aims for mass production of their products for sale to peace-loving governments and law-abiding citizens. Furthermore, UDMC uses only the best softwares procured from Dassault Systemés of France.
Technical Specifications
Technical Specifications
TECHNICAL SPECIFICATIONS
Q – What are the specifications of your F5 and S5 Rifles?
United Defense Mfg Corp’s F5-PVAR, S5-PVAR, F5-DGIS and S5-DGIS rifles are variants of the M16 and M4 rifles and come in two types: The “F-series” are the full automatic models for military, police and law enforcement use, and the “Sseries” are the semi-automatic models for commercial, civilian and security agency use. These rifles are chambered in the time-tested 5.56 NATO round (5.56 x 45mm) and designed to hit point targets at 500 meters (MER). The F5 and S5 series take after the M4 and M16 battle rifle designed by Eugene Stoner. They use two different action designs, the Direct Gas Impingement System (DGIS) and the patented Pneumatic Valve and Rod (PVAR). The DGIS is the simpler design between the two as it has less parts and uses the hot gases coming from the gas port of the barrel and through a gas tube the hot gases are rammed into the bolt carrier group to cycle the round. On the other hand, the Pneumatic Valve and Rod (PVAR) gas-piston or simply the patented PVAR™ system or Pneumatic Valve and Rod System is a “bare bones, no frills and very simple” designed gas and piston operating system that utilizes a combination of gas and mechanical energy for a more effective and reliable cycling of the weapon. The PVAR design prevents hot and high-pressured gases from reaching the bolt assembly and the chamber. This results in a cleaner and reliable operation, as well as minimal maintenance even in the most rugged environments such as jungles, deserts, snow and salt-water conditions. This means reduced cleaning time and overall longer rifle life span. The PVAR’s simplified parts and mechanism allows reduced recoil and reduced muzzle rise, which enables the firer to refocus instantly on the target for each and every round fired! The DGIS uses a lightweight thermoplastic handguard and the PVAR uses a one piece Key-Mod handguard with a military standard 1913 Picatinny top rail held securely only at the barrel extension which allows the barrel to “float” and reduce barrel vibration while in battery. This allows for greater accuracy and consistency. As designed, the barrel does not touch any part of the entire length of the handguard except at the barrel extension. The barrel comes in different lengths: 6.5, 7.5, 10.5, 11.5, 14.5, 20 and 22 inches. We recommend the PVAR for shorter barrels 6.5 and 7.5 inches.
Classification - Military Assault Rifle (F-series), Commercial Sporting Rifle (S-series)
Country of Origin - U.S.A. for the DGIS and Philippines for the PVAR
Designed - 2009 for the PVAR series
Manufacturer - United Defense Mfg Corp, Philippines
Operating System - PVAR gas and piston, rotating bolt head, Letters of Patent Nos. 1-2009-000176 and 1-2011-000062, Philippines or the DGIS, rotating bolt head, conventional direct gas impingement system
Bolt Carrier - Monolithic one piece with a solid punch key for the PVAR and two piece with gas key for the DGIS
Cartridge - 5.56 NATO (5.56 x 45mm)
Barrel Type - Non-Glare, matte stainless steel bull barrel, AISI-416 Premium or the black parkerized carbon steel ordnance grade. Note: Both barrel types are not chromelined.
Barrel Length - Choice of 6.5, 7.5, 10.5, 11.5, 14.5, 16, 18, 20 and 22 inches
Rifling - 1 x 8 twist
Muzzle Velocity - Approximately 3,100 ft/sec (M855), it may vary depending on barrel length
Maximum Effective Range - 500 meters (point target) and 600 meters (area target), it may vary depending on barrel length
Accuracy - One (1) MOA using a match grade ammunition at 100 meters, at bench rest.
Trigger - Single stage, with option for two-stage for semi-auto precision use.
Flash Hider - Choice of SHURIKEN flash hider (Letter of Patent No. 1-2013-000230, Philippines) or any type of tactical compensator or flash hider.
Weight - 4.5 kg more or less depending on barrel length and model
Length - Depends on buttstock and barrel length
Firing Selector - Semi/Full-automatic (F-series) and Semi-automatic only (S-series)
Feed System - 30-round detachable magazine
Q – What are the specifications of your S7 Rifles?
United Defense Mfg Corp’s S7-PVAR and S7-DGIS are variants of the M110-SASS, Semi-Automatic Sniper System precision rifles chambered in the time-tested 7.62 NATO round (7.62 x 51mm) and designed to hit point targets up to 800 meters (MER). The S7 takes after the M110 battle rifle designed by Eugene Stoner. The S7 uses two action designs, the Direct Gas Impingement System (DGIS) and the patented Pneumatic Valve and Rod System (PVAR). The DGIS has a simpler design between the two as it has less parts and uses the hot gases coming from the gas port of the barrel and through a gas tube the hot gases are rammed into the bolt carrier group to cycle the round. The patented PVAR or Pneumatic Valve and Rod System is a “bare bones, no frills and very simple” designed gas and piston operating system that utilizes a combination of gas and mechanical energy for a more effective and reliable cycling of the weapon. The PVAR design prevents hot and high-pressured gases from reaching the bolt assembly and the chamber. This results in a cleaner and reliable operation, as well as minimal maintenance even in the most rugged environments such as jungles, deserts, snow and salt-water conditions. This means reduced cleaning time and overall longer rifle life span. The S7-PVAR’s simplified parts and mechanism allows reduced recoil and reduced muzzle rise, which enables the sniper to refocus instantly on the target for each and every round fired! Furthermore, the PVAR allows the sniper to select if he wants to use the rifle in bolt-action mode or self-loading (semi-automatic) mode. Both the PVAR and DGIS models use a one piece Key-Mod picatinny rail handguard held securely only at the barrel extension which allows the barrel to “float” and preserve barrel harmonics while in battery. This allows for greater accuracy and consistency. As designed, the barrel does not touch any part of the entire length of the handguard except at the barrel extension. For both the DGIS and PVAR, the barrel comes in different lengths: 18, 20, 22, 24 and 25 inches. For special orders, UDMC can also produce the M110-CSASS or the “compact SASS”, with semi and fully automatic selector, with a retractable buttstock with a barrel length of 14.5 or 16 inches for use by the spotter. The non-glare, matte finish of the Stainless Steel 416 Premium barrel is also an alternative to the standard carbon steel in black manganese finish. The two-stage trigger (for the S7 only) is as crisp as it can be. While UDMC also produces the conventional DGIS system, the PVAR is more rugged than the conventional M110-SASS DGIS and most bolt-action precision rifles out there.
Classification - Precision Rifle
Country of Origin - U.S.A. for the M110 (S7-DGIS) and Philippines for the S7-PVAR
Service History - Launched in January 2014 for the S7-PVAR
Designed - 2013 for the S7-PVAR
Manufacturer - United Defense Mfg Corp, Philippines
Operating System - PVAR gas and piston, rotating bolt head, Letters of Patent Nos. 1-2009-000176 and 1-2011-000062, Philippines or the DGIS, conventional direct gas impingement system
Bolt Carrier - Monolithic one piece with a solid punch key for the PVAR and two piece with gas key for the DGIS
Cartridge - 7.62 NATO (7.62 x 51mm)
Barrel Type - Non-Glare, matte stainless steel bull barrel, AISI-416 Premium or the black parkerized carbon steel ordnance grade.
Barrel Length - Choice of 14.5, 16, 18, 20, 22, 24 and 25 inches Rifling - 1 x 12 twist or 1 x 10 twist
Muzzle Velocity - Approximately 2,600 ft/sec Maximum Effective Range (22-inch barrel) - 800 meters (point target) and 1,000 meters (area target)
Accuracy - One (1) MOA using a M118LR ammunition at 100 meters, at bench rest.
Trigger - Single stage, with option for two-stage for semi-auto precision use.
Flash Hider - Choice of SHURIKEN flash hider (Letter of Patent No. 1-2013-000230, Philippines) or any type of tactical compensator or muzzle brake.
Weight - Around 7.5 kg to 8.5 kg, inclusive of the floating KeyMod picatinny rail handguard, scope, bipod and a loaded 20-round detachable box magazine. Weight will be less depending on barrel length and type of scope.
Length - 44 inches (22-inch barrel)
Rate of Fire - Semi-automatic. (Note: However, when “Made-to-Order”, we can also produce the F7 battle rifle series which is the full automatic version for use by the spotter in tandem with the sniper who uses the semi-automatic version only.)
Feed System - 10 or 20-round detachable magazine
Q – What are the specifications of your Single Stack 1911 Pistol?
Classification - Semi-automatic pistol, M1911
Country of Origin - UNITED STATES Service History - 1911 to Present
Designed - 1911 and 1924 (A1 model)
Manufacturer - United Defense Mfg Corp, Philippines
Operating System - Recoil operated, closed breech, single action
Trigger / Action - Fires one round each time the single action trigger is squeezed and the hammer is cocked by the action of the slide.
Cartridge - .45 ACP
Barrel Type/s - Standard with barrel bushing, no ramp, AISI-416 stainless steel Premium ordnance grade
Barrel Length - 5 inches Rifling & Grooves - 1 x 16 twist rate
Velocity - Approximately 825 ft/sec (230 grains FMJ)
Energy - 483 J (356 ft·lb)
Frame – one piece 4140 steel, milled from bar-stock
Weight - Approximately 1.2 kg
Length - 8.25 inches (5-inch barrel)
Height - 5.25 inches (excluding magazine base pad)
Rate of Fire - Semi-automatic
Feed System - detachable single stack magazine Body Color / Finish - Silver hard chrome, nickel, or black parkerized
Safeties - Grip safety, sear disconnect, slide stop, half cock position, and manual thumb safety (ambidextrous)
Q – What are the specifications of your High Capacity 1911 Pistol?
Classification - Semi-automatic pistol, M1911
Country of Origin - UNITED STATES
Service History - 1911 to Present
Designed - 1911 and 1924 (A1 model)
Manufacturer - United Defense Mfg Corp, Philippines
Operating System - Recoil operated, closed breech, single action
Trigger / Action - Fires one round each time the single action trigger is squeezed and the hammer is cocked by the action of the slide.
Cartridge - .45 ACP, .40 S&W and 9mm
Frame – two piece with the main frame made of 4140 steel machined from bar stock and the grip made of hard polymer.
Barrel Type/s - Bull barrel, ramped, no bushing, AISI-416 Premium stainless steel ordnance grade
Barrel Length - 5 inches Rifling & Grooves - 1 x 16 twist rate
Velocity - Approximately 825 ft/sec (230 grains FMJ)
Energy -483 J (356 ft·lb)
Weight - Approximately 1.5 kg
Length - 8.25 inches (5-inch barrel)
Height - 5.25 inches (excluding magazine base pad)
Rate of Fire - Semi-automatic
Feed System - 12+1 rounds (caliber .45) and 16+1 rounds (caliber .40 and 9mm), detachable double stack magazine. Magazine capacity can vary depending on magazine type and model.
Body Color / Finish - Silver hard chrome, nickel or black parkerize
Safeties - Grip safety, sear disconnect, slide stop, half cock position, and manual thumb safety (ambidextrous)
Q – What are the features of the S5-DGIS Mid-Length Model? How does it differ compared with the S5-DGIS Standard Model?
A - The term "Mid-Length Barrel" is actually a misnomer because the barrel length is actually the same. What it simply means is that the barrel uses a "midlength gas tube" of 11.25 inches long. Typically, the standard carbine has a gas tube length of 9.75 inches. This gas tube length of 9.75 inches is the one used for barrels 10.5-inch, 11.5-inch, 14.5-inch up to 16-inches.
The relatively new concept of mid-length gas tube (11.25 inches) was designed for and usually installed on a 16-inch barrel can also be adopted on a 14.5-inch barrel. A 16-inch barrel using a mid-length gas tube means that the placement of the drilled gas port in the barrel will be at 7 inches measured from the tip of the muzzle of the rifle instead of the standard specification of 8.5 inches from the muzzle tip. For the 14.5-inch barrel, it will be anywhere from 5.5 to 6.0 inches from the muzzle tip, depending on your choice. The effect is that there will be a little bit less gas pressure being rammed back into the BCG gas key. The use of a mid-length gas tube on a 16-inch or 14.5 inch barrel will render a slightly “softer” shooting, less recoil and less muzzle rise AR rifle.
Since UDMC produces its own barrels from cylindrical blanks, we are now able to introduce this new S5-DGIS Mid-Length model on a 14.5 and 16-inch barrels. Actually, we can drill the gas port in wherever part of the length of the barrel, something that AR assemblers cannot accomplish for you unless they “weld” the originally-drilled gas port which will eventually give way in no time at all.
The only drawback if you order from us this Mid-Length Barreled S5-DGIS is that it will be more expensive. Why? It’s because we will have to install a longer handguard since we will not be able to use the standard M4-length handguard. The handguard that we will install will be a T6 aluminum “KeyMod railguard” that will float the barrel, a feature that a purist competitive shooter wants as it aids in better accuracy. As another option, the KeyMod railguard can cover or not cover the gas block front sights. If you want the gas block inside the railguard, we will install a “low-profile” gas block that will fit inside the railguard. That will also mean a longer railguard to cover the gas block. For the latter design, we will install our own UDMC-fabricated set of flip-up sights for the front and rear.
Q – What are the specifications of the S5-Stubby Model?
A – The S5-Stubby Model is a sub-model of the S5-PVAR. It uses a 6.5 inch barrel made of either carbon steel or stainless steel 416 Premium grade. It has a shorter bolt carrier group and a shorter buttstock tube, if compared with the standard M4 rifle. It comes only in a PVAR system since very short barrels that are less than 10.5 inches can only cycle reliably in the PVAR gas-piston system. Total unretracted length of the Stubby is only 22 inches!
Q – What are the specifications of the “Bare Bones” Model?
A – The “Bare Bones” model is an S5-DGIS or S5-PVAR model but without the furnitures like handguard, flash hider, carry handle, sights, pistol grip and buttstock. This model was introduced in order to allow “purists” to install their own furnitures on the rifle.
Q – What type of ammo can your rifles use?
A – For the caliber 5.56 NATO, it can use any brand of M193 or M855 ammo. For the caliber 7.62 NATO, it can use any brand of M80, M118 and M118LR ammo. It can also use the commercial type of .308 WIN ammunition.
Q – What are the maximum effective ranges (MER) of your rifles?
A – For the caliber 5.56mm NATO, 500 meters for the 14.5 inches barrel.
A – For the caliber 7.62mm NATO, 800 meters for the 22 inches barrel.
Q – What are the maximum effective ranges (MER) of your pistols?
A – For the caliber .45, MER is 100 meters for the 5 inches barrel.
__________________________________
Maximum Effective Range (MER) *To borrow a definition, MER is “The maximum range within which a weapon is EFFECTIVE against its intended target”. This would translate into the maximum range that the weapon could effectively put a man out of action.
_________________________________
Q – Is caliber .223 equivalent to caliber 5.56mm NATO?
A – No, it is not exactly the same in chamber and ammunition headspace. As a rule of thumb, you can use .223 ammo on a 5.56 barrel but not vice-versa.
Q – Is caliber .308 WIN equivalent to caliber 7.62mm NATO?
A – No, it is not exactly the same in chamber and ammunition headspace. However, we have already perfected our S7 and F7 barrels to accommodate both types of ammunition.
Q – What type of barrels do you use for the rifle and for the pistol?
A – For both rifles and pistols, we use only Stainless Steel 416 Premium or carbon steel in ordnance grade and duly certified from source or origin of the blanks as raw materials.
Q – Do you manufacture your own barrels?
A – Yes we do. We manufacture them from barrel blanks supplied to us by DikarBergara from Spain. We are the Exclusive Distributor of Dikar Bergara for all their products, barrel raw materials (blanks) including their bolt-action rifles in the whole of Asia-Pacific.
Q – What is so special about your UDMC barrels?
A - The Bergara cylindrical blanks are made from the finest carbon steel and 416 Premium stainless steel, used in the ordnance, aerospace and defence industries.
A - If other suppliers will claim that their barrels are SS-416 Premium, only a Certificate of Chemical and Mechanical Analyses can determine its quality. UDMC’s AISI 416 Stainless Steel PREMIUM ordnance grade barrel has contents of Vanadium, Nickel and Molybdenum which are not found on a standard AISI 416 stainless steel barrel. The net effect is that the United Defense-Bergara barrels have a yield strength of 780 MPa (versus 275 MPa of std AISI-416 SS) and a tensile strength of 920 MPa (versus 517 MPa of std AISI-416 SS). In terms of toughness, UDMC barrel is 73 Joules versus 34 Joules of the std AISI-416 SS.
A - If required by the customer, we can issue a certification that the barrel installed on his or her UDMC rifle is a United Defense-Bergara PREMIUM Ordnance Grade barrel.
A - The optimum combination of high hardness, yield strength, and tensile strength, along with the correct toughness, allow UDMC barrels to withstand the generated pressures when the rifle is in battery, even with powerful rounds such as the .30 caliber or the .50 caliber precision rifles.
A - UDMC barrels, compared with other stainless steel barrels in the firearms industry, are very hard steel which increases the mechanical properties of the barrels and it is fair to say that this is one of the best insurance from the safety point of view of a barrel. In addition to this, one of the differences of UDMC barrels is the small grain size of its molecular structure thus guaranteeing excellent toughness. The homogenous microstructure during hardening and tempering provides a uniform hardness along the bar, producing a very uniform rifled bore, which is the key to accuracy of a barrel. The heat treatment, in combination with the precise deep hole drilling, honing and button rifling process results in a uniform finish of the bore under 0.0008 inches. The stress relieving heat treatment on the other hand, after the button rifling process, protects the bore from inside deformation after the tapering of the barrel. It also helps protect the barrel from heat generated after continuously firing several hundreds of rounds.
A - The same level of quality speaks of the UDMC-Bergara carbon steel barrels in durability, safety and accuracy. A - Finally, the high chromium content of UDMC-Bergara barrels provides a good corrosion resistance to it.
Q – What is your warranty on the life cycle of your pistol barrels?
A – 20,000 rounds minimum under normal use.
Q – What is your warranty on the life cycle of your rifle barrels?
A – 10,000 rounds minimum under normal use.
Q – What raw materials do you use for the rifles?
A – We use T6-7075 for the upper and lower receivers, T6-6061 for the handguard (or thermoplastic) and buttstock tube. For metal parts, we use only 4140, 4150 and MIM-S7 for the small parts. Our barrels are made either of Stainless Steel 416 Premium or carbon steel, Premium ordnance grade which has contents of Molybdenum, Nickel and Vanadium not found in other barrels which makes it double the tensile strength versus other barrels in its category.
Q – What raw materials do you use for the pistols?
A – We use 4140 in barstock for our slides and frames and MIM for the small parts. Our barrels are made of Stainless Steel 416 Premium Premium ordnance grade.
(UPDATED APRIL 11, 2016)