Precision Reflex MK12 MOD 0 SPR Gen III Complete Upper 5.56 NATO 18" 1:7 Twist FDE

The Precision Reflex MK12 MOD 0 SPR Gen III is a complete AR-15 upper receiver kit chambered in 5.56 NATO, built around an 18" barrel with a 1:7 twist rate — optimized for stabilizing heavier match-grade projectiles favored in Special Purpose Rifle configurations. The MK12 platform is designed around a rifle-length gas system, consistent with the 18" SPR barrel length. This Gen III build features a Flat Dark Earth Cerakote finish on the upper receiver. The handguard configuration follows the MK12 MOD 0 specification, typically a free-float rail system suited for SPR duty. Muzzle device details are not confirmed in the source data.