Have seen that several times on sporterized Mausers.

by JohnKDM, Saturday, September 20, 2025, 13:28 (16 days ago) @ AaronB

The Weaver base screws are usually overlong. It is also recommended to install the bases with the screws loose, then tighten/loosen them one at a time to ensure the base is secure when torqued and not the screw bottoming in a blind hole. Might want to check that as well if you already haven't.

Sometimes the easiest issues (if you miss them on the first pass) are the hardest to sort out.

Related information. I have what was known back when as a 'screw gizzie' - just two pieces of spring stock riveted together with a hole in one side for the screw threads to pass though. The other spring captures the head of the screw while you touch the threaded end to a grinder in order to shorten it. This device was ensconced in a special place and now I can't find it. If it is eventually found, it will be ensconced in an extra extra special place so that it will not be lost a second time...