Stainless steel gas tube with included roll pin. Nothing fancy — this is the part that routes gas from your gas block back to your bolt carrier to cycle the action. CMMG makes them to spec, they fit, and they work.
The important thing is ordering the right length for your barrel and gas system. If your barrel is drilled for a mid-length gas system, you need the mid-length tube. Getting this wrong means the tube either won’t reach the gas block or won’t seat properly in the upper receiver. If you’re not sure which gas system length your barrel uses, check the manufacturer’s spec sheet for your barrel before ordering.
Each kit includes the gas tube and a 5/64″ x 5/16″ roll pin for securing the tube to the gas block. You’ll need a roll pin punch and a small hammer for installation.
Price range: $15.95 through $19.95
The CMMG Gas Tube Kit is a stainless steel replacement gas tube for AR-15 platform rifles. Each kit includes the gas tube and a 5/64″ x 5/16″ roll pin for securing it to the gas block.
The gas tube connects the gas block on your barrel to the gas key on your bolt carrier group. When a round fires, gas travels through the barrel’s gas port, into the gas block, through the tube, and back into the upper receiver to cycle the bolt. It’s a straightforward part, but it needs to be the correct length for your barrel’s gas system — an incorrect length tube will not function.
Available in four lengths:
These are general guidelines. Always confirm your barrel’s gas system length with the barrel manufacturer’s specifications before ordering, as some barrel makers use non-standard gas port locations.
Installation requires a roll pin punch and hammer. The tube inserts through the upper receiver and into the gas block, then is secured with the included roll pin driven through the gas block’s pin hole.
Specs:
| Spec | Detail |
|---|---|
| Manufacturer | CMMG |
| Product Type | Gas Tube Kit w/ Roll Pin |
| Material | Stainless Steel |
| Roll Pin Size | 5/64″ x 5/16″ |
| Platform | AR-15 |
| Available Lengths | Pistol, Carbine, Mid-Length, Rifle |
| Kit Includes | Gas tube (1), Roll pin (1) |
| Country of Origin | USA |
Other products you may be interested in
Guides and reviews from the Action Gunner team
