Adjustable Carbine Stock & Buffer Tube Assembly | Polymer80

About this product

Complete Your AR-15 Build with the Adjustable Carbine Stock & Buffer Tube Assembly

Whether you’re working with a stripped lower or have just finished an 80% lower, this buffer tube assembly is an essential component for making your firearm functional. It works seamlessly with your lower parts kit to ensure smooth operation between your lower and upper receivers.

What’s Included in the Kit

• Buffer Tube
• Carbine Buffer
• Recoil Spring
• Castle Nut
• Latch Plate
• Adjustable Buttstock

Technical Specifications and Compatibility

This assembly features a mil-spec buffer tube with an outer diameter of 1.148 inches and a thread pattern of 1-13/16″ x 16, ensuring compatibility with virtually all modern AR-15 receivers, including those from Polymer80. It’s designed for use with adjustable stocks and braces, with appropriate detents for secure adjustments.

Ideal for Multiple Calibers

Included is a 3.0-ounce carbine buffer, suitable for calibers like 5.56/.223, 300 Blackout, and 6.5 Grendel. It also works with AR-9 lowers, though a heavier buffer is recommended for optimal performance in 9mm builds.

Easy Installation and Expert Tips

Installation is straightforward with tools like an armorer’s wrench and roll pin punches. For a complete build, pair this with a barreled upper assembly from our shop. This product is backed by Polymer80’s reputation for quality and reliability in the firearms community.

Note: Always follow local laws and safety guidelines when assembling firearms.