Strike Industries AR-15/LR-308 Carbine Aluminum Pistol Receiver Extension Buffer Tube

A carbine-length pistol receiver extension built for shooters who demand serious materials in their AR platform builds. The Strike Industries AR-15/LR-308 Carbine Aluminum Pistol Receiver Extension Buffer Tube is machined from 7075-T6 aluminum—a significantly stronger alloy than the 6061 commonly found in budget alternatives—making it a substantial upgrade for pistol builds, short-barreled rifles, and AR pistol PDW platforms. Whether you're assembling a precision range gun or a tactical carbine, this tube provides the durability and rigidity needed for reliable cycling and longevity.

The design includes a supported, anti-rotation buffer retaining plunger that keeps components locked in place during operation. A sling swivel is machined directly into the rear, enabling effective push-pull shooting techniques and easier weapon manipulation. Strike Industries offers two profile options to suit your build: the Slick Version presents an unobstructed, smooth profile ideal for mounting aftermarket pistol braces—including Strike Industries' own Viper Pistol Stabilizer—while the Rail Version integrates a picatinny rail across the back for mounting a monopod, optic mounts, or auxiliary storage solutions.

Compatible with both AR-15 and LR-308 platforms, this receiver extension replaces the factory tube on pistol-configured uppers and lowers. Installation follows standard AR assembly procedures. If you're upgrading from a stock or lightweight tube, the superior material strength and anti-rotation engineering provide a tangible improvement in fit, feel, and reliability—the kind of refinement that separates a purpose-built rifle from an improvised one.

Key Features

• 7075-T6 aluminum construction for greater strength than standard 6061 alloy tubes
• Supported, anti-rotation buffer retaining plunger for secure component lockup
• Machined sling swivel integrated into rear for push-pull operation
• Slick Version compatible with popular aftermarket pistol braces and stabilizers
• Rail Version includes integrated picatinny rail for monopod or accessory mounting
• Fits AR-15 and LR-308 platforms

Specifications

Frequently Asked Questions

What's the difference between the Slick and Rail versions?

The Slick Version has a smooth, unobstructed profile that works with standard aftermarket pistol braces and Strike Industries' Viper Pistol Stabilizer. The Rail Version integrates a picatinny rail along the rear, allowing you to mount a monopod, tactical light mounts, or picatinny-compatible storage solutions.

Is this compatible with AR-15 and AR-10 / LR-308 builds?

Yes, this receiver extension is designed for both AR-15 and LR-308 platforms, making it a flexible choice for multiple build types.

How is 7075-T6 aluminum different from standard buffer tubes?

7075-T6 is a much harder, more durable aluminum alloy than the 6061 used in many standard tubes. It provides greater rigidity and strength, reducing wear and improving the overall structural integrity of your build.

What does the anti-rotation buffer retaining plunger do?

The supported anti-rotation plunger prevents the buffer and spring from rotating or shifting during operation, keeping components stable and ensuring consistent cycling and reliability.