AR-15 PCC Heavy-Duty 6-Position Buffer System Kit with 8 oz. Long Buffer, Carbine Spring, Castle Nut & End Plate

AR-15 PCC Heavy-Duty 6-Position Buffer System Kit with 8 oz. Long Buffer, Carbine Spring, Castle Nut & End Plate

This is a complete AR-15 PCC buffer system kit, pairing an 8-ounce extended, long-style stainless steel buffer with a Mil-Spec heavy-duty six-position carbine buffer tube and the hardware needed to install it, built for blowback-operated pistol-caliber platforms in 9mm, .45 ACP, or 10mm.

Key Features

• Mil-Spec heavy-duty 6-position carbine buffer tube
• 8 oz. extended, long-style PCC buffer, stainless steel, black finish
• Standard AR-15 carbine recoil spring, made in the USA
• US Tactical Mil-Spec receiver end plate and carbine castle nut included
• Compatible with 9mm, .45 ACP, and 10mm blowback platforms

Buffer Tube and Buffer

At the center of this kit sits a Mil-Spec heavy-duty six-position carbine buffer tube, machined to standard Mil-Spec dimensions and adjustable across six positions to dial in stock or brace length. Riding inside it is an 8-ounce buffer, built in an extended, long profile and machined from stainless steel for a durable, corrosion-resistant surface finished in black. Blowback-operated pistol-caliber carbines rely on bolt mass rather than a gas system to manage the timing of the action, and this extended buffer adds the additional weight those platforms need to cycle correctly and control bolt velocity in 9mm, .45 ACP, or 10mm builds. A standard AR-15 carbine recoil spring, made in the USA, works alongside the buffer to return the bolt carrier group forward after each cycle.

Buffer System Hardware

Securing the buffer tube to the lower receiver is a US Tactical AR-15/M16 Mil-Spec receiver end plate paired with an AR-15 carbine castle nut, giving the buffer tube a stable, properly torqued connection to the rest of the lower.

Follow all manufacturer instructions and safe handling practices.

Ensure compliance with all applicable federal, state, and local laws.