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Posted: 3/17/2011 3:27:11 AM EST
My uncle passed away just before New Years and my father inherited his Thompson. We took it out and shot it a few weeks ago and the mag catch seemed to be sticky like it didn't want to lock the mags in place. It basically stays where ever you move it. I suspect that either the spring is damaged or simply under powered, there is a burr somewhere causing it to hang up, or it needs to be oiled but I'm not expert.

I think I know how to field strip it but how do I get in there to check it out or swap out the spring if need be?
Link Posted: 3/17/2011 3:29:38 AM EST
I'd start in the armory.
Link Posted: 3/17/2011 4:35:06 AM EST
IIRC the mag catch on the new production Thompsons is slightly different. I believe you can get a surplus catch that will drop right in and work with old mags
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