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The gas tube is one of those small parts that your whole rifle leans on. It channels high-pressure gas from the gas block back to the bolt carrier key, which is what drives the action and keeps your AR-15 cycling round after round. CMMG builds this one from stainless steel with a silver finish, and it's cut to carbine length, meaning it's the right fit for AR-15s running a carbine gas system, typically found on barrels in the 10.5 to 16 inch range. It measures right around 9 3/4 inches and ships with the installation roll pin included, so it's ready to drop into your build or swap in as a replacement.
Carbine length is the most common gas system out there on 16 inch AR-15s, so this covers a huge slice of builds. Keep in mind it's cut specifically for carbine spacing and won't line up with mid-length or rifle-length gas blocks, so it's worth double checking your barrel's gas port location before ordering. If you're not sure, measure from the barrel extension to the gas port and match it to carbine spacing.
Installation is straightforward if you've done AR work before. Slide the tube into the gas block with the gas port hole facing down toward the barrel, line up the roll pin holes, and drive the pin home with a proper roll pin punch and a light hammer. CMMG's roll pin uses a 5/64 inch punch, and you want the pin sitting flush on both sides. Once it's pinned, cycle a bolt carrier through to confirm the gas key slides over the tube without binding. That quick check saves you from short-stroking headaches down the road.
Stainless steel is a smart pick here because the gas tube lives in a brutal heat and pressure environment, and CMMG has a long reputation for turning out solid AR-15 parts. Whether you're finishing a fresh upper or bringing an old rifle back to life, this kit gets you a reliable, no-surprises gas tube with the hardware to match.
This tube is cut for carbine-length gas systems, which are most common on AR-15 barrels in the roughly 10.5 to 16 inch range. The gas system length depends on where the gas port sits on your barrel, not just the barrel length, so check your barrel's spec if you're unsure. It won't fit mid-length or rifle-length gas placements.
Yes. The kit includes the installation roll pin, so you have everything needed to pin the tube into your gas block. You'll want a 5/64 inch roll pin punch and a small hammer to seat it properly.
Stainless steel holds up well in the high heat and pressure the gas tube deals with, and it resists corrosion over the long haul. CMMG has a strong track record with AR-15 parts, so this is a dependable choice for a component your rifle relies on to cycle.
After pinning the tube into the gas block, install a bolt carrier group and cycle it by hand. The gas key should slide over the tube smoothly without binding or hard resistance. If it snags, the tube or gas block likely needs a small alignment adjustment before you reassemble.
| UPC | 815835012384 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 55DA193 |
| Color | GAS TUBE KIT |
| Length | 9 3/4 |
| Model | |
| Product Type | Gas Tube |
| Shipping Weight | 0.0688 |
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