The BRDE gas block PRO drilling jig A is used to drill Vltor, BCM and Older Rainier Arms 0.750" bore gas blocks for pinning.
Cold rolled carbon steel
Waterjet and CNC machined opening
Manganese Phosphate finish
#31 drill hole, 1 side with replaceable hardened insert
Includes 1/4"-28tpi x 3/8" soft point set screw
Includes one #31 jobber drill bit and 1/8" hex key
Please email me for PDF instructions.