Shot my new(new to me but slightly used) springfield 1911 today before my IDPA match and the slide would not lock back on a empty mag. I only put about six or seven mags through it before I had to help set up the courses. The gun shot fine without any malfunction it just would not lock back on the last round. My finger wasnt close to the slide stop (I made sure after the second time it happened). The ammo was just factory loaded winchester so it wasnt the ammo. Im guessing it was the mags, one is a springfield factory mag which looks to be in very good shape and the other two are old G.I mags. One of the G.I mags locked the slide back but the other two didn't. Is it the mags or something else?
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