Rifles & Machine guns – 5.56mm and 7.62 caliber – Fail-Safe
UTM 5.56mm Man-Marker and Target Bullet Round Conversions are uniquely designed to prevent the discharge of traditional 5.56mm/.223 “live” ammunition (5.56 NATO, 5.56 x 45mm, and .223 Remington). Fail-Safe is achieved by utilizing an offset firing pin design, which will only work with the rim fire primer used in the UTM Cartridge, but not with a “live” center fire cartridge. In the event a 5.56mm “live” cartridge is chambered and the trigger is pulled, the Conversions offset firing pin will strike outside the primer pocket of the 5.56mm “live” round. This makes it impossible to detonate the “live” cartridge in the UTM converted weapon.
An example of a “Live” cartridge discharge attempt in a UTM converted weapon.
Standard ‘Live’ M16/M4 Rifle Bolt Carrier Assembly
Shown is a standard M16/M4 bolt carrier assembly. Notice the relationship between the firing pin and the red circle indicating the size and location of the “Live” primer.
UTM M16/M4 Rifle Bolt Carrier Assembly
This applies to all UTM rifle conversions.
UTM TBR M16/M4 Rifle Bolt Carrier Assembly
As an additional safety feature, TBR ammunition has a recessed primer to prevent firing pin contact from a “Live” or MMR bolt carrier assembly.
UTM’s Rifle and Carbine conversions and conversion kits are designed and engineered for the upmost in safety, in-service reliability and maintainability. The conversions and kits are easy to install, typically a simple exchange of the manufacturer’s Bolt and Carrier Assembly. UTM conversions adapt the host weapon to fire UTM ammunition with the feel and function of “live” ammunition. With the exception of the HK-416 and SIG 516, which require their own conversion, the UTM standard rifle bolt conversion will function in any right hand ejecting, direct impingement or gas piston M4/M16/AR-15®.
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