Phase 5 Weapon Systems — Buffer Tube Complete Assembly (PBT-CA) — Black Billet Aluminum — AR-Pistol Platform — UPC 813318020413

Meta (SEO) short description: Phase 5 Weapon Systems PBT-CA Buffer Tube Complete Assembly for AR-pistol platforms — billet aluminum pistol buffer tube, enhanced buffer spring, carbine buffer, mil-spec end plate & castle nut, nitrile foam pad. UPC 813318020413. Impact Guns+1

Product Overview

The Phase 5 PBT-CA (Pistol Buffer Tube Complete Assembly) is a ready-to-install buffer tube kit designed specifically for AR-pistol builds. Machined from billet aluminum and finished in matte black anodize, this compact 7.4"-style pistol tube pairs Phase 5’s enhanced buffer spring and a standard 3 oz. carbine buffer with a durable nitrile foam pad to deliver a stout, reliable rear-end solution for brace or pad installations. The lower tube slot is machined to accept mil-spec end plates and sling mounts for added versatility. AR15Discounts+1

Key Features & Benefits

• Complete, build-ready kit: PBT-CA ships with the billet pistol buffer tube, Phase 5 enhanced buffer spring, carbine buffer (≈3 oz), mil-spec end plate and castle nut, plus a durable nitrile/NPVC foam pad — everything you need to finish an AR-pistol lower. Impact Guns+1

• Billet aluminum construction: CNC-machined from high-grade aluminum for strength and precision fitment while keeping weight low compared with steel replacements. Wing Tactical

• Pistol-length profile: Compact overall length (pistol configuration) is optimized for stabilizing brace setups and pistol builds that require a shortened, brace-ready rear while retaining a carbine buffer interface. OpticsPlanet

• Enhanced spring for reliable cycling: The included Phase 5 enhanced buffer spring improves return energy and reliability in short-gas or suppressed pistol builds where a standard spring can sometimes fall short. GunMag Warehouse

• Brace and accessory friendly: The tube’s lower slot accepts all mil-spec end plates and common sling mounting accessories; many users report good compatibility with popular stabilizing braces (confirm brace manufacturer guidance prior to installation). OpticsPlanet+1

Detailed Specifications

• Model / Part: PBT-CA (Pistol Buffer Tube Complete Assembly). Impact Guns

• UPC: 813318020413. Impact Guns

• Material: Billet aluminum (CNC machined). Wing Tactical

• Finish: Black anodized / mil-spec hard coat. Wing Tactical

• Includes: Pistol buffer tube, Phase 5 enhanced buffer spring, mil-spec carbine buffer (~3 oz), castle nut, mil-spec end plate, nitrile/NPVC foam pad. Confirm exact retail package with the seller. AR15Discounts+1

• Outer diameter: ~1.25" (typical for AR pistol/carbine tubes). AR15Discounts

Who Should Buy This

• Builders assembling an AR-pistol who want a premium billet aluminum tube with hardware included. Cabela's

• Shooters converting a carbine layout into a pistol or matching a stabilizing brace/pad for compact handling and improved control. OpticsPlanet

• Anyone replacing a fatigued spring or upgrading the rear-end of their AR to an American-made, billet solution for longevity and improved fit/finish. GunMag Warehouse

Compatibility & Installation Notes

• Brace compatibility: Designed to work well with many stabilizing braces when installed per the brace manufacturer’s instructions; confirm compatibility before mounting. OpticsPlanet

• Buffer & spring pairing: The kit’s carbine buffer and Phase 5 enhanced spring are chosen to balance weight and return force for reliable cycling in pistol configurations; certain suppressed or unusual caliber setups may benefit from buffer tuning—consult a qualified armorer if unsure. GunMag Warehouse

• Receiver fit: Installs like a standard mil-spec receiver extension. Use proper torque specs for castle nut and verify end plate alignment during installation. If you’re not comfortable installing it yourself, have a qualified gunsmith perform the fitment. Palmetto State Armory

Care & Maintenance

• Wipe anodized aluminum surfaces with a soft cloth and apply light lubricant to threads and moving parts as needed.

• Check castle nut torque and end plate security after initial break-in and periodically during regular maintenance.

• Inspect the enhanced spring for signs of wear and replace if tension loss or visible deformation occurs to ensure ongoing reliability. GunMag Warehouse

Why Choose Phase 5’s PBT-CA

Rather than sourcing individual parts, the Phase 5 PBT-CA offers a single, OEM-matched solution that eliminates guesswork—designed to provide a compact, durable rear assembly with a quality buffer spring and comfortable foam pad included. Built to work with common mil-spec components and stabilizing braces, this kit speeds up builds and upgrades while delivering the fit and finish builders expect from billet aluminum components. Impact Guns+1

SEO-Optimized Closing Paragraph

If you’re building or upgrading an AR-pistol and want a hassle-free, high-quality rear end, the Phase 5 Weapon Systems PBT-CA Buffer Tube Complete Assembly (UPC 813318020413) is an excellent choice. With a billet aluminum pistol tube, Phase 5 enhanced buffer spring, carbine buffer, mil-spec hardware, and a resilient nitrile foam pad included, the PBT-CA delivers a compact, reliable, and brace-ready solution—perfect for tactical, range, or HD-oriented pistol builds. Confirm compatibility and included hardware with your retailer before purchase to ensure the best fit for your platform. Impact Guns+1

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