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Every reliable AR runs on good gas flow, and the gas tube is the small part that makes it happen. CMC's mid-length version is precision-machined from 304 stainless steel and treated with a durable nitride finish, giving you a component that shrugs off heat, carbon, and corrosion while feeding consistent gas back to the bolt carrier group. It measures roughly 11.75 inches, which puts it squarely in mid-length territory for barrels in the 14 to 20 inch range where a softer, more balanced recoil impulse is the goal.
The nitride treatment is the real story here. It boosts surface hardness and fatigue strength while adding a layer of corrosion resistance that plain stainless doesn't have on its own. That matters on a part sitting right in the path of hot, dirty gas cycle after cycle. The black finish also keeps things low-profile under a handguard, so it disappears into the build instead of standing out. Made in the USA and covered by CMC's 100 percent lifetime warranty, it's the kind of part you install once and forget about.
This is a standard mid-length gas tube built to spec, so it drops into any mil-spec low-profile gas block or A2 front sight base designed for a mid-length system. The gas port hole faces down toward the barrel and the collar pins in place with a standard gas tube roll pin. If you're swapping out a bent or carbon-caked tube, or piecing together a fresh upper, matching the tube length to your gas system is the one thing to get right before anything else.
Whether you're chasing a smoother-shooting 16-inch carbine or refreshing a well-used rifle, this tube covers the mid-length job without drama. It's a straightforward, quality piece from a company better known for its triggers, and that same attention to machining shows up here.
Mid-length gas systems are most common on barrels in the 14 to 20 inch range, with 16-inch builds being the sweet spot. The mid-length setup places the gas port farther out than a carbine system, which gives you a softer recoil impulse and gentler cycling. Always match your tube to the gas system your barrel is actually cut for, not just the barrel length.
Gas tubes ship as the tube alone, so plan on supplying your own gas tube roll pin if your gas block doesn't already have one. The standard AR gas tube uses a small slotted spring pin that passes through the gas block and the tube collar. They're inexpensive and easy to source, so it's worth grabbing a couple of spares while you're at it.
Yes. This is a standard-spec mid-length tube, so it fits any mil-spec low-profile gas block or A2 front sight base built for a mid-length system. Just make sure the gas port hole on the tube faces down toward the barrel and the roll pin holes line up during install.
The nitride finish increases surface hardness, wear resistance, and fatigue strength while adding real corrosion protection to the 304 stainless base. Since the tube lives in a stream of hot, dirty gas every time you fire, that extra durability pays off over the long haul. It also carries CMC's lifetime warranty, which speaks to how they build it.
| UPC | 859464006321 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 81623 |
| Color | Black |
| Length | 12 |
| Model | |
| Product Type | Gas Tube |
| Shipping Weight | 0.05 |
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