I'm looking at a pretty nice Remington 4M range 03a3 barreled action that was the basis for a thrown-together bubba special. Fortunately, the receiver has not been drilled and tapped and the metal finish appears to be original and in very good condition. The problem is that the goober who made the BR into a "finished" rifle put a mismatched front sight base on BACKWARDS! Can someone tell me what diameter size punches I will need to remove the sight blade from the base, and then remove the base from the barrel. I'm fresh out of '03 literate gunsmiths in my area and would prefer to fix the problem myself if possible. I haven't bought the rifle yet, but if I can rescue it without spending more than it's worth, I will. Thanks in advance for your help.