Ive done it before, but I forgot which size drill bit and tap and die to use. Can someone tell me the correct sizes so I dont screw up my barrel? If you tell me wrong, Im gonna blame you for it lol. I know what Im doing, just forgot the sizes! help!

I believe the 2 most common are #31 drill and 6x48 screws and #28 drill and 8x40 screws.

thank ya man, I appreciate it.