Phase5 Ar15 Pistol Buffer Tube Assy

The Phase 5 AR-15 Pistol Buffer Tube Assembly (PBT-CA) is a complete, mil-spec compliant buffer tube system engineered for AR pistol platforms and stabilizing brace configurations. This assembly combines billet aluminum construction with precision machining to deliver consistent bolt carrier group cycling and recoil management in compact firearm builds where space and reliability are equally critical.

The assembly integrates Phase 5's enhanced buffer spring, mil-spec carbine buffer, mil-spec end plate, mil-spec castle nut, and proprietary NPVC-constructed buffer tube foam pad. The lower receiver slot is precisely machined to accept all mil-spec end plates and standard sling mounting accessories without modification. Black hard-coat anodize finish provides corrosion resistance and a low-visibility appearance. The design is fully compatible with Sig Sauer pistol stabilizing braces and other industry-standard brace systems, making it a direct-fit upgrade for existing pistol builds or a foundation component for new builds.

This buffer tube assembly serves operators, competitive shooters, and builders working with AR-pattern pistols who require mil-spec reliability without proprietary parts that limit future upgrades. The complete assembly eliminates the need to source individual components—buffer, spring, end plate, and castle nut arrive as a matched, tested unit. Operators integrating this assembly with stabilizing braces gain the recoil stability and consistent lockup that dedicated pistol platforms demand, whether for close-quarters work, off-duty configuration, or range-proven testing.