The BRDE gas block drilling jig RA is used to drill, Rainier Arms 0.750" bore gas blocks for pinning.
Cold rolled carbon steel
Waterjet and hand fit opening
Manganese Phosphate finish
#31 drill hole
Includes 1/4"-28tpi x 3/8" soft point set screw
Includes one #31 jobber drill bit and 1/8" hex key