So I added the muzzle brake from Straight Shooters. I really like the way it looks on the rifle. I want to remove the rear sight yet. Should I put some screws in the rear sight holes? Does anyone know what thread size they are? I have about 150 pellets through it now. I'm still getting some smoke out of the barrel from each shot. I thought it shot a nice 5 shot group tonight for still breaking in. This was from 42 yards off my deck.