Columbian Mauser Threading Question!
I have a 1952 Columbian Mauser action and I have the trigger guard, but not the screws that mount the guard to the action. I have a set of trigger guard screws from a 98 Germany Mauser, but these don't work either for some reason. I know the German Mauser screw thread is 1/4"-22 Whitworth thread. Anybody know if they used some other thread for the trigger guard back then?
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Whether it was made by R. Famage or VZ, it should have the guard screw pitch of 1/4-22. Brownells still lists the 1/4-22 tap and dies. I would run the tap through the holes and clean them up and use the German screws.
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Yeah, I talked with Brownell, they say that their 1/4"-22 tap is NOT for a Whitworth thread. In fact, they say their tap is UN (uni-national) which means it's a 30-60 Degree thread. So, if I did use that tap it would hog out the threads to an oversized condition, and my German screws would now "wallow" in the same holes. 😕
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The actual German tap used was M3.5 x .55 which is next to impossible to find. The 55 degree pitch is close enough to the 60 degree pitch of the Brownells tap.
If using the 1/4-22 gives enough concern, which it shouldn't, try using an original guard screw and dremel out a thread cutter on the lead-in thread. Use some 180 grit lapping compound and run the screw in to clean up the old threads.
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Why not simply order the correct screws from Brownells?
Did you ask if they could provide them?
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