Gas Block Dimple Jig

thingiverse

This is a versatile gas block dimpling jig suitable for various hole patterns found in gas blocks. It accommodates .3, .4, .45, .46, .47, and .5 diameters. Simply take a M4 or 5/32 machine screw and bevel its end using a grinder; then, insert the screw into the gas port on your barrel. The resulting hole pattern will emerge on the opposite side of the screw head, providing a precise template for dimpling. Next, use a 5/32 drill bit to create the desired dimples.