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The CMMG Low-Profile Gas Block is the kind of part that quietly does its job and gets out of the way. Built for the AR-15 platform and bored for a .750" gas journal, it's machined low enough to slide cleanly under most free-float rails and drop-in handguards. If you're ditching a chunky old front sight base or building an upper from the barrel up, this is the piece that clears the way for a slimmer, more modern setup.
It's cut from 4141 chrome moly steel and wears a matte black finish, so it takes the heat and holds its own inside a hot gas system for the long haul. CMMG backs their parts with a lifetime guarantee, which tells you where they stand on the durability question. This is a non-adjustable, fixed-port block, so it does one thing and does it without fuss. For a standard carbine, mid-length, or rifle-length build running the correct gas port, that's usually all you want out of a gas block.
The block attaches with two set screws, and the installation screws come in the box. A pair of takeaways from folks who install these regularly: degrease the barrel and screws, use a thread locker, and dimple your barrel at the set screw locations if it isn't already. That dimple lets the screws seat deeper and bite in, which keeps everything from walking forward under recoil. Line up the gas port carefully before you snug things down, and you'll get a solid, wobble-free fit.
One thing worth planning for: the gas tube and roll pin are not included, so grab those separately if you don't already have them on hand. Pair this with a quality gas tube kit and you've got the backbone of a clean, reliable direct-impingement system.
This block is bored for a .750" gas journal, which is the most common diameter on AR-15 barrels. Measure the seat where your old block or front sight base sat to confirm you have a .750" journal. If yours measures .625" or .936", you'll want the matching size instead.
No. The assembly ships with the two set screws only. You'll need to source a gas tube in the correct length (carbine, mid-length, or rifle-length) and a gas tube roll pin separately.
It's a good idea if your barrel isn't already dimpled. A small dimple at each set screw location lets the screws seat deeper and grip the barrel, which helps prevent them from walking forward under recoil. Pair that with degreased threads and a quality thread locker for a fit that stays put.
No, it's a fixed-port, non-adjustable design. It's meant to run a barrel with a properly sized gas port for your build. If you want to tune gas flow for a suppressor or a specific load, you'd look at an adjustable block instead.
| UPC | 852005002622 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 55DA38D |
| Color | Black |
| Length | 4.5000 |
| Model | |
| Product Type | Gas Block |
| Shipping Weight | 0.34 |
| Style | Low Profile |
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