AR-15 Pistol Buffer Tube Assembly by Phase 5 Weapon Systems
Phase 5 Weapon Systems
$59.95
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Phase 5 Weapon Systems
AR-15 Pistol Buffer Tube Assembly by Phase 5 Weapon Systems
The Phase 5 Weapon Systems AR-15 Pistol Buffer Tube Complete Assembly (PBT-CA) delivers a purpose-built, California-compliant solution for AR-15 pistol builds, bundling every essential component into one precision-engineered package.
- Billet aluminum pistol buffer tube machined to exacting Mil-Spec tolerances
- Includes Phase 5's enhanced buffer spring for reliable, consistent cycling
- Mil-Spec carbine buffer provides optimal bolt carrier group timing and recoil management
- Mil-Spec castle nut and end plate ensure a rock-solid, rattle-free lower receiver fit
- Lower slot machined to accept all Mil-Spec end plates and sling mounting accessories
- Ultra-durable NPVC foam buffer tube pad protects the tube and shooter during use
Who This Is For
This assembly is ideal for AR-15 pistol builders who want a complete, ready-to-install buffer tube kit without sourcing individual components. It works seamlessly with the SIG Sauer pistol stabilizing brace, making it a top choice for SBR-style pistol configurations and California-compliant AR pistol builds where a fixed or non-stock tube is required.
Specifications
| Brand | Phase 5 Weapon Systems |
|---|---|
| Model | PBT-CA |
| Platform | AR-15 Pistol |
| Tube Material | Billet Aluminum |
| Tube Standard | Mil-Spec |
| Finish | Matte Black Anodized |
| Buffer Type | Mil-Spec Carbine Buffer |
| Included Components | Buffer tube, buffer spring, carbine buffer, castle nut, end plate, NPVC foam pad |
| Brace Compatibility | SIG Sauer Pistol Stabilizing Brace |
| Sling Mount | Yes (Mil-Spec end plate slot) |
Frequently Asked Questions
Will this pistol buffer tube work with a pistol stabilizing brace?
Yes. The Phase 5 PBT-CA is specifically designed to be compatible with the SIG Sauer pistol stabilizing brace and most other commercially available AR-15 pistol braces that fit a standard Mil-Spec diameter tube. Because the tube does not feature stock attachment grooves, it is appropriate for pistol-configured AR builds.
Is this a complete kit, or do I need to buy additional parts?
This is a true complete assembly. It includes the billet aluminum pistol buffer tube, Phase 5's enhanced buffer spring, a Mil-Spec carbine buffer, a Mil-Spec castle nut, a Mil-Spec end plate, and an NPVC foam buffer tube pad. No additional buffer components are needed — simply install onto your lower receiver.
What makes this buffer tube "pistol" specific versus a standard carbine tube?
A pistol buffer tube is shorter than a standard carbine tube and lacks the adjustment notches used to position collapsible rifle stocks. This design is required for legally configured AR-15 pistols, as it prevents the attachment of a conventional buttstock. The Phase 5 PBT-CA is purpose-machined for this application, making it the correct choice for any AR pistol build.
