Phase 5 PBT-CA Pistol Buffer Tube Assembly, Black Aluminum

Description

The Phase 5 PBT-CA is a complete AR-15 pistol buffer tube assembly designed for AR pistol platforms. It pairs a billet aluminum pistol buffer tube with Phase 5’s enhanced buffer spring and a carbine buffer to provide a durable, Mil-Spec-compatible assembly. The unit ships with a Mil-Spec end plate, castle nut, and an ultra-durable foam pad. The lower slot is machined for compatibility with Mil-Spec end plates and sling mounting accessories.

Key Specifications

• This assembly is a Buffer Assembly intended for AR pistol platforms.
• The buffer tube is constructed from billet aluminum.
• The visible finish/color is Black.
• Fit is specified as AR-15 Pistol.
• Includes Pistol buffer tube, castle nut, and Mil-Spec end plate.
• Also includes carbine buffer and Phase 5 enhanced buffer spring.
• The lower slot is machined to accept Mil-Spec end plates and sling mounting accessories.
• Compatible with SB Tactical pistol stabilizing braces that accept round tubes.
• Not compatible with adjustable braces (SBA3, SBA4, PDW).
• Designed to work with a Mil-Spec carbine buffer and spring.

Built around a billet aluminum tube and Mil‑Spec hardware, this assembly offers a durable foundation for AR pistol builds and brace installations that accept round tubes. Its machined lower slot and included components simplify installation while providing a snug fit to minimize unwanted movement. The Phase 5 PBT-CA is a solid choice for shooters seeking a rugged, Mil‑Spec-compatible buffer tube assembly for their AR pistol platform.

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