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The gas tube is one of those parts nobody thinks about until it stops doing its job, and then your whole cycle of operation falls apart. CMC Triggers built this pistol-length version for the shortest AR gas systems out there, where reliable gas flow matters even more because you have less dwell time to work with. It measures 6.705 inches, machined from 304 stainless steel and finished in a durable black nitride that fights corrosion, resists wear, and adds a little fatigue strength for the long haul.
Nitride is more than a good-looking coating. It hardens the surface of the stainless steel, so the tube holds up to the heat and fouling that build up right at the gas port, and the low-glare black finish looks right at home inside any upper. CMC has aerospace manufacturing roots, and that attention to tolerances shows up in a tube that seats cleanly and lines up the way it should during assembly.
This is the shortest gas system CMC offers, sized for AR-15 and AR-10 style pistols and short-barreled setups running a pistol-length gas port. If you are piecing together an upper or replacing a tube that has seen better days, matching the tube length to your gas block location is the part that matters most. Get that right and installation is straightforward with a roll pin and a punch.
Every one of these is made in the USA and backed by CMC's lifetime warranty, which tells you they stand behind the work. It is an inexpensive piece of the puzzle that plays an outsized role in whether your gun runs, so it is worth using a quality tube from a name people trust. Grab one as a spare for the range bag while you are at it, since these tend to be the kind of part you only miss when you do not have it.
This is the shortest gas system CMC makes, at 6.705 inches, and it pairs with AR-15 and AR-10 style setups running a pistol-length gas port. It is a common choice for short-barreled uppers and AR pistols. The key is matching the tube to the location of your gas block so the timing works out right.
The nitride treatment hardens the surface of the 304 stainless steel, boosting resistance to corrosion, wear, and heat right where fouling collects at the gas port. It also gives the tube a low-glare black look that blends into any upper. That combination helps the tube hold up over a long service life.
Listings vary on this, so it is worth confirming before you count on it for your build. Some retailers ship these with the gas tube roll pin and others do not. Roll pins are inexpensive and easy to source separately, so keep a couple on hand just in case.
Yes, CMC Triggers backs the gas tube with a lifetime warranty. It is made in the USA and machined to tight tolerances thanks to the company's aerospace manufacturing background. For a part this important to reliable cycling, that peace of mind goes a long way.
| UPC | 859464006307 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 81621 |
| Color | Black |
| Length | 9.4000 |
| Model | |
| Product Type | Pistol |
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