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5/32 or 3/16. You have plenty of exposed base after you traverse the ramp to either extreme. You need a drill bit of the correct size to match the desired size tap. You could use a larger screw, just...

I never have been a fan of glue or shims on a gun. If the rear sight is not a rarity, remove it and wind the ramp to either extreme, drill a small hole thru the top of the base and thread it for a...