CMMG LOW PRO GAS BLOCK .750 ID

Description

When you’re building or upgrading an AR-pattern rifle, the gas block is one of those components that shapes how the entire system functions—and a low-profile design opens up options that a standard front sight base simply doesn’t allow. By sitting below the bore line, this block clears virtually any free-float handguard without requiring a cutout or proprietary fit, giving you the freedom to run a continuous rail or a smooth tube from receiver to muzzle.

CMMG machines this block from 4140 chrome moly steel, which gives it the durability to handle sustained heat from the gas port without distorting over time. The fit is sized for a .750-inch barrel diameter, the standard journal found on most mil-spec carbine and mid-length barrels, so it drops onto common builds without modification. Installation hardware is included, so you’re not hunting for the right set screws before you can get the rifle back together.

The design is non-adjustable, which keeps things simple—no external knob to snag on gear or drift out of setting under recoil. For most standard AR builds running factory ammunition, a fixed-port gas block is all you need, and one fewer adjustment point means one fewer thing to troubleshoot. CMMG backs this, along with all of their components, with a Lifetime Quality Guarantee. If you’re sourcing parts for a new build or replacing a bulky front sight tower, this block does the job cleanly and without unnecessary complexity.