CMC Triggers 81622 AR Parts - Black Nitride 304 Stainless Steel, 9.79"

A quality AR-15 gas tube is one of those build components that runs quietly in the background—until it fails, and suddenly your rifle won't cycle. The CMC Triggers 81622 AR gas tube is built to prevent that scenario. Machined from 304 stainless steel and finished with a black nitride coating, this 9.79" gas tube is engineered to handle the pressure cycling demands of semi-automatic AR platforms without breaking down. The nitride surface resists corrosion and wear, meaning reliable function whether you're running suppressed loads, hunting, or running rounds downrange at the range. CMC Triggers manufactures this tube in the USA, so you're getting a component made to real standards, not a commodity import.

The gas tube is one of the least glamorous parts of an AR-15 build, but it's absolutely critical to function. When gas exits the barrel and enters the tube, it travels back through the system to cycle the bolt and chamber the next round. A poorly made or undersized tube can cause short-stroking, failure to eject, or erratic reliability. CMC's approach—quality material and a hardened finish—addresses the two failure modes that take down gas tubes: material fatigue and corrosion.

This tube fits the rifle-length gas system, so verify your build's gas tube length (pistol, carbine, mid-length, intermediate, or rifle) before ordering. If you're assembling an AR from a parts kit or replacing a worn tube, a quality component like this one is one of the smartest investments you can make. It's not something you'll see when the rifle is dressed out, but you'll feel it every time the gun runs clean.

Key Features

• 304 stainless steel construction for strength and corrosion resistance
• Black nitride finish resists wear and extends service life
• USA-made—built to real manufacturing standards
• 9.79" rifle-length specification
• Drop-in compatible with standard AR-15 platforms

Specifications

Frequently Asked Questions

What length gas tube do I need for my AR-15?

This is a rifle-length gas tube (9.79"). AR platforms come in pistol, carbine, mid-length, intermediate, and rifle lengths. Verify your upper receiver or parts kit specs before ordering—installing a mismatched tube will cause reliability problems.

Will this gas tube work with my AR-15 upper?

Yes, this tube is compatible with standard AR-15 platforms built to rifle-length gas system specs. It's a drop-in component, though you may want to verify your upper's gas tube bore and length to ensure proper fit.

Why does the nitride finish matter?

The black nitride finish hardens the 304 stainless steel surface, preventing corrosion from powder residue, moisture, and bore chemicals, and reducing friction and wear from repeated cycling. This extends the life of the tube and supports reliable function over thousands of rounds.

Is this tube for semi-auto or full-auto ARs?

This tube is designed for standard semi-automatic AR-15 platforms. Do not use on automatic or military-spec rifles without consulting the manufacturer or a qualified gunsmith.