The Aero Precision M4E1-T Pro Upper Receiver Group 16" Black is a complete, ready-to-run assembly built around the M4E1 threaded upper and a rigid MOD 4 free-float M-LOK handguard. Its cold hammer...

The American Tactical Alpha Maxx 410 Upper Shotgun Kit transforms a standard mil-spec AR-15 lower into a smooth-shooting .410 bore shotgun platform. This dedicated upper features an 18.5" smooth bore...

The Aero Precision M4E1-T Complete Upper Receiver with ATLAS S-ONE Handguard and 12.5" barrel in Flat Dark Earth is built for shooters who want a compact, lightweight AR-15 upper without sacrificing...

The Primary Weapons Systems MK111 Mod 1-M Upper Receiver brings the proven PWS long-stroke piston system to a compact AR-15 platform. Built on fully forged 7075-T651 aluminum receivers with a...

The Primary Weapons Systems MK118 Mod 1-M Complete Upper Receiver in 6mm ARC brings a refined, piston-driven upgrade to the AR-15 platform. Built around an 18-inch threaded barrel and PWS’s proven...

The TacFire BU-308-20 Rifle Upper Assembly brings a ready-to-run .308 Win AR-platform upper together in one complete package. Built around a 20" black nitride barrel and a black anodized 7075-T6...

The TacFire BU9MM4 Pistol Upper Assembly 9mm Luger pairs a compact 4" black nitride barrel with a sleek 7075-T6 aluminum black anodized receiver and ventilated M-LOK handguard. This complete...

The LaRue Tactical LT-018 22" 6.5 Creedmoor Match Grade Upper Receiver Assembly is built for shooters who demand precise, repeatable performance from their AR-10 platform. Featuring a 22-inch match...

The TacFire BU-556-16 Rifle Upper Assembly brings together a 16" black nitride 5.56x45mm NATO barrel, forged 7075-T6 aluminum receiver, and a sleek M-LOK free float handguard to create a...

The Primary Weapons Systems MK1-M1U-300BLK9 MK109 Mod 1-M Upper Receiver brings PWS’s proven long stroke piston system to a compact 9.75" 300 Blackout platform. Built on a forged AR-15 upper with a...

The TacFire BU-9MM-10 Pistol Upper Assembly brings a streamlined AR-platform 9mm Luger upper together in a ready-to-install package. Built around a 10" black nitride barrel and a black anodized...

The Primary Weapons MK114 Mod 1-M Upper 223 Wylde 14.50" Anodized Barrel for AR-15 is built for shooters who want a refined, piston-driven upper that drops onto any standard AR-15 lower. Featuring a...