CMMG AR15 Pistol/PDW Gas Tube Kit with Roll Pin

Building or repairing an AR15 pistol or PDW? The CMMG AR15 pistol-length gas tube kit handles a critical job in your upper receiver assembly. This stainless steel gas tube is designed specifically for pistol-length gas systems—shorter than rifle-length tubes and tuned for the higher cyclic rates and compact profiles that define AR pistols and short-barreled rifles. Whether you're assembling from scratch or swapping out a worn component, CMMG's gas tube delivers reliable feeding and extraction when paired with the right bolt carrier group and buffer setup.

The kit includes the gas tube itself plus the roll pin needed to secure it during installation, so you won't be hunting for hardware. Stainless steel construction resists corrosion and handles the heat cycles of pistol-caliber shooting without degradation. This is a straightforward, no-frills part that does exactly what it should: meter gas reliably and keep your bolt cycling in rhythm with your load and barrel length.

If you're running an AR9, AR45, or 5.56 pistol build, proper gas system tuning makes the difference between a smooth shooter and a finicky one. A pistol-length tube is a core component of that equation, and CMMG's reputation for quality AR parts makes this a solid choice for builders and gunsmiths who know what they're after.

Key Features

• Stainless steel construction resists corrosion and heat stress
• Pistol-length design engineered for compact AR platforms and PDW builds
• Includes installation roll pin—no separate hardware purchase needed
• OEM-quality component from CMMG, a trusted AR manufacturer

Specifications

Frequently Asked Questions

Will this gas tube fit my AR9 or AR45 pistol build?

This is a pistol-length gas tube designed for AR15 pistol and PDW platforms. Verify your upper receiver and bolt carrier are configured for pistol-length gas before purchasing. If you're unsure whether your build uses pistol or rifle-length gas, check your upper receiver specs or consult a gunsmith.

Does the kit include everything I need to install it?

Yes. The kit includes both the gas tube and the roll pin required for installation. You'll need standard AR assembly tools (roll pin punch, hammer), but no additional parts are required.

What's the difference between pistol-length and rifle-length gas tubes?

Pistol-length gas tubes are shorter and position the gas port inlet closer to the muzzle. This metering design is optimized for the shorter sight radius and higher cyclic rates of pistol builds. Rifle-length tubes are designed for full-length rifle uppers and will not function correctly in a pistol-length system.

Can I use this to repair an existing AR pistol?

Yes. If your current gas tube is damaged, bent, or timing your build poorly, this CMMG replacement is a direct drop-in fix. Just verify it's pistol-length before ordering.