These gas blocks are offered in 17-4PH stainless steel, in your choice of a matte Black Oxide or Silver (bare) finsih.

With the various rail systems currently being offered for the AR15/M16/M4 weapon system, the  Low-Profile Gas Block is small enough to fit inside most rail systems.The Vltor Low-Profile Gas Block covers one-inch of the barrel's surface and is made to the tightest tolerance.