Quoted: Went to the range today and fired about 100 rds through five different 15-rd mags. The slide would not lock back on the last round with any of the mags.
It would lock OK if I manually pulled the slide back on an empty mag, though. I have the feeling the slide is travelling forward faster than the spring tension can push up on the slide lock/release.
Absolutely no other problems. Mag spring too light?
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My guess is, pay attention to where your right thumb is while shooting. I had to train my right thumb to stick more vertical because it was resting on the slide stop. When I keep it straighter up, wallah, locks back. That was what my problem was. Take a look at your grip, given that you do it the same every time, and see if that could be the problem. When this happen to me, I though it was my pistol too.
I wrote this assuming your gun is new to you, but I suppose it's pertinent either way.