UTM conversions work with both gas-impingement and piston-driven rifles. With UTM bolt, there is no gas tube, making rifle a straight blowback action. UTM long-gun conversions involve swapping out the bolt. In handgun versions, both the front and rear primers are traditional Boxer primers. UTM handgun cartridges and rifle cartridges are similar in design. The biggest difference among all the UTM Rounds is the rear primer used to cycle the firearm normally. Based on a two-year study by Picatinny Arsenal, UTM munitions have a 99.8% reliability rating. In fact, the cycle reliability of UTM munitions rivals that of factory loaded live ammo. UTM munitions solve that cycling problem. Anyone experienced with training rounds knows that weapon function is a huge problem. This dual primer design means UTM munitions are the most reliable non-lethal training rounds. Importantly, the marking projectile is powered by the front primer only, not by the rear Blank cartridge or rear primer. All the front primers are the traditional Boxer design, which launches the bullet. This primer produces the energy to cycle the gun and launch the self-contained firing ball to ignite the front primer. The rear primer is either a Blank cartridge (rifle) or Boxer primer (handgun). The result is optimized weapon reliability and optimized accuracy and range. The primer with the right amount of power for cycle reliability is used independently of the primer with the right amount of power for the desired bullet velocity. With UTM munitions, the energy needed to cycle the gun is totally separated from the energy needed to propel the bullet. ![]() It is this dual primer system that gives UTM ammo the clear advantages of both cycle reliability and accuracy. When it goes off, a round firing-pin ball is driven into the front primer, which ignites and propels the bullet. The weapon’s firing pin strikes the rear primer. The UTM cartridges are built with a rear primer and a separate front primer. The dual primer system used by UTM munitions sets them apart from all other less-lethal munitions. Since the primer is recessed into the case, a longer firing pin is also required. Since this is such a different project in UTM’s training munitions line, special measures are taken. Use of the TBR also permits the use of rifles in a shoot house made from handgun-rated AR500 steel, which is much less expensive than rifle-rated AR550 steel. The solution is the TBR, which allows the entire shoot house to be made up of just ¾-inch plywood. These are not force-on-force rounds but are designed to be used in live-fire shoot houses.In these houses, live-fire ammo tears up both used tires and wooden railroad ties. Of all the UTM munitions, the TBR fires a potentially lethal projectile, a 6.6-grain aluminum projectile. ![]() The exceptions in the UTM lineup are the TBRs in 9mm and 5.56mm. For example, MMR non-lethal round will not fire from same setup that fires TBR. Same UTM bolt will not fire both lethal and less-lethal rounds. SHOOT-HOUSE AMMOĬonversions are available for any AR-15 platform most SIG Sauer, FN, Steyr, and AK platform rifles and Colt, FN, and HK sub-guns. You still need eye protection but not ear protection. It uses two primers, one to cycle the gun and one as a noisemaker. It is intended for close-range defensive tactics and disarm training. The SBR uses only a primer to cycle the gun but does not fire a projectile and does not produce any noise. In addition to the marking rounds, UTM training munitions include the Silent Blank Round (SBR), Battlefield Blank Round (BBR), Target Bullet Rounds (TBR), Loud Blank Round (LBR), and Reduced Velocity Round (RVR). The MMR is the clear choice for reliable and realistic force-on-force training. ![]() These traditional marking cartridges are available in red, blue, green, and yellow. UTM is best known for their Man Marker Round (MMR).
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