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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