[quote=Boba Debt ]
Well they fit my 6-48 thread gage. I had no way to check the rifle though.


[/quote

Go to the hardware store and get a 6-48 tap, they are cheap enough. There are different classes of fit (tolerances) in taps and hardware stores stock the loosest fit. Run the tap into the holes 1/4 turn at a time then back them off and turn in again, repeat that until your tap is through (except on the one over the barrel) to clean them out. Having one around to clean out loctite and crud when installing or changing mounts is handy to have. Blueing salts get in the holes and hardens when they dry off. Usualy has a white powdery look.

El Lobo