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The Phase 5 PBT-CA gives you everything you need for a reliable AR-15 pistol build in one complete package. This is a fully assembled solution that skips the hassle of sourcing individual components, so you can focus on getting your build finished and to the range.
The core of this assembly is a CNC-machined 7075 T651 billet aluminum pistol buffer tube finished in a hard-anodized military-grade black. This isn't the cheapest material choice, but it's the right one, providing durability and consistency that cheaper alternatives simply can't match. The material resists wear and corrosion while maintaining tight tolerances that ensure smooth operation over thousands of rounds.
You're getting the pistol buffer tube itself, an enhanced buffer spring from Phase 5, a Mil-Spec carbine buffer, Mil-Spec end plate, castle nut, and an ultra-durable NPVC foam pad. That covers every component you need to drop into your lower receiver. The lower slot is machined to accept standard Mil-Spec end plates and sling mounting accessories, giving you flexibility for how you want to configure your setup.
This assembly works great with round-tube pistol stabilizing braces like those from SB Tactical, providing a snug fit that keeps things locked in place during operation. The design lets you position your brace exactly where you want it without any movement getting in the way of your performance. Just note it's not compatible with adjustable-style braces like the SBA3, SBA4, or PDW models.
The Phase 5 PBT-CA is engineered for AR pistol platforms and delivers the precision and dependability you'd expect from a manufacturer known for quality components. Whether you're building your first pistol or your fifth, this assembly takes the guesswork out of the process.
The PBT-CA works great with round-tube braces like those from SB Tactical, providing a snug fit that minimizes movement. However, it's not compatible with adjustable-style braces such as the SBA3, SBA4, or PDW models. Always verify your specific brace's compatibility before purchasing.
This is a complete assembly that includes the pistol buffer tube, enhanced buffer spring, carbine buffer, end plate, castle nut, and foam pad. You get everything needed to install it into your AR-15 pistol lower receiver. You won't need to source additional components like springs or buffers.
No, the PBT-CA is specifically designed for AR-15 pistol platforms and is not suitable for rifle or carbine builds. Its design and components are optimized for pistol configurations. For carbine or rifle builds, you'll need a different buffer tube assembly designed for those platforms.
The NPVC foam pad that comes with the PBT-CA absorbs impact and reduces noise during operation. While it's functional as-is, you can replace it with aftermarket pads if you prefer a different feel or material, as long as they're designed for Mil-Spec round tubes.
| UPC | 813318020413 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | PBT-CA |
| Color | Black |
| Product Type | Buffer Tube Complete Assembly |
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