CMMG LOW PRO GAS BLOCK .936 ID

Description

Switching to a free-float handguard or a one-piece rail system on an AR platform means the factory front sight block has to go, and that leaves you needing a gas block that sits below the handguard’s inner diameter without interfering with it. CMMG’s low-profile gas block is built for exactly that job — a straightforward, no-frills component that keeps gas routed from the barrel port to the tube without adding height or bulk.

The block is machined from 4140 chrome moly steel, which gives it the durability to handle the heat and pressure cycling a gas block sees over the long term without the weight penalty of a heavier material. Attachment is handled by two set screws, making installation and timing to the barrel’s gas port a matter of patience and a properly sized Allen wrench rather than any specialized tooling. The matte black finish keeps things corrosion-resistant and low-visibility under a handguard where aesthetics are irrelevant anyway.

The .936-inch bore fits the barrel diameter found on many heavy-profile and government-profile AR barrels, so confirm your barrel’s gas block seat diameter before ordering — this is not a universal fit across all AR builds. Installation hardware is included, but the gas tube roll pin is not, so have one on hand if you’re doing a complete upper build from scratch rather than a block swap on an existing assembly.