The TacFire Pistol Upper Assembly is a complete, factory-built solution chambered in 5.56x45mm NATO. It features a 7 4150 Chrome Moly Steel barrel with a black nitride finish and a standard A2 flash hider. Built on a forged 7075-T6 aluminum receiver with a black anodized finish, this AR-Platform unit includes a modular black M-LOK free-float handguard for accessory mounting. This plug-and-play upper comes fully assembled with a Mil-Spec bolt carrier group and charging handle, providing a compact and reliable option for pistol or SBR builds. Note: This complete assembly is chambered in 5.56x45mm NATO, which allows for the safe and reliable use of both 5.56 NATO and .223 Remington ammunition.