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Mine started doing that too. I know it's not my thumb, I think it's my mags (15 rounders).

I bought a used P99 recently and there was no problems during my first outing. I disassembled & cleaned the mags and during my next outing the slide wasn't locking back after the last shot 50% of the time.

I think I may have used too much lube. I cleaned off the lube but haven't had a chance to try 'em out.

I received some 10 round mags and I noticed the follower and the little "button" that engages the slide stop are higher than my 15 rounders. I was planning on buying new springs and followers for my 15 rounders as they've already seen 2,500 rounds.
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