Military-style semi-auto rifles often lack firing pin retraction springs. Without careful ammunition assembly, a "slam-fire" can happen before the bolt locks. The military uses different techniques and components to manage this, including primers with different sensitivity specifications than their commercial equivalents. These CCI 41 small primersfor 5.56mm reduce the risk of a slam-fire when other elements become unpredictable*. When reloading for a military semi-auto, consider CCI Military primers Effective slam-fire prevention involves more than specialized primers. Factors like headspace, chamber condition, firing pin shape and protrusion, bolt velocity, cartridge case condition, and more can influence slam-fire potential. Key CCI Standard Primers #41 (Small) 5.56mm Military specifications: Mil-spec sensitivity Initiator mix optimized for ball/spherical propellants Small (No. 41) rifle Use the same data as CCI Magnum primers Military-style semi-automatic rifles Ensure safer reloading with CCI #41 primers designed to reduce slam-fire risks in military-style rifles. Buy the CCI #41 primers now!