CMMG 55DA3AC Low-Profile Gas Block .625" Black Chrome Moly Steel

The CMMG 55DA3AC is a low-profile gas block built for AR-15 platforms using a .625" gas block seat. Machined from 4140 chrome moly steel and finished in a corrosion-resistant black coating, this non-adjustable gas block clamps directly to a barrel's gas journal and provides a clean, low-profile foundation for your gas tube and free-float handguard setup.

The slim low-profile footprint is the upgrade of choice when stepping away from an A2-style fixed sight block, freeing up rail space for optics and back-up iron sights while keeping the front of the rifle tidy under a drop-in or free-float rail system. Installation screws are included so the block can be torqued down right out of the package, and the .625" inside diameter matches standard AR-15 barrel gas seats. Whether you are building a fresh rifle, replacing a worn factory block, or finishing a free-float conversion, the CMMG 55DA3AC is a straightforward drop-in solution.