The CMMG Low-Profile Gas Block (brand part number 55DA3AC) is sized for a .625-Inch gas-block barrel diameter and machined from chrome moly steel for long-term durability at the gas port. CMMG includes installation screws with the block, so it’s ready to clamp on and use with a free-float rail system right out of the box. The block is made from 4140 chrome moly steel and can replace an A2 front sight base. It’s a straightforward way to lower a build’s profile compared to a standard front sight base while keeping the gas system reliable.

Key Specifications

• .625-Inch Barrel Compatibility matches this common AR-15 gas-block diameter.
• Chrome Moly Steel Construction holds up to sustained heat and pressure at the gas port.
• Low-Profile Design clears a free-float rail system in place of a standard front sight base.
• Installation Screws Included completes the kit without sourcing separate hardware.
• Free-Float Rail Compatible is built to be covered by a free-float handguard.
• AR-15 Platform Compatibility fits standard AR-15 upper receivers.
• CMMG Build Quality reflects the company’s standard for AR-15 gas system components.

Frequently Asked Questions

Does this include mounting screws? Yes, installation screws are included.

What barrel diameter does this fit? A .625-Inch gas-block barrel diameter.

Why choose a low-profile gas block? It clears a free-float rail system, unlike a standard front sight base.

Buy the CMMG Low-Profile Gas Block, .625-Inch, Chrome Moly Steel

Clean up your upper with a CMMG Low-Profile Gas Block from our AR gas system selection. Order online and we’ll ship it straight to your door from our Lubbock, Texas gun shop.