I had the same problem on the G30 I have after I went the firearms training in the academy. I had a different grip and my thumb would ever so slightly touch the slide stop. Shocked me when it happened and realized what it was had to work on my thumb placement with the grip we use.
Well, there have been new ideas surface here today. I guess we are waiting on a follow up to the O.P.'s original issue, and what steps have been taken or if it's cured. I just thought reading the replies from today, and since it surfaced again, I'd like to add a few cents for what I'm worth. The Wolff magazine springs suggestions always seem to get me, and I feel that I cannot keep silent any longer about it. This seems like an opportune time for me, and I'm gonna go for it. I have never used anything other than Glock stock (OEM) magazine springs in any (any) of my Glock magazines. I've had issues with several mags, and always replaced them with Glock springs and/or followers. Riding on some 12+ years of Glock ownership, carry, and hard range time. I've bought used magazines like you wouldn't believe to save a buck or two and increase their numbers. Over the years I've probably had five (5) magazines that have given me problems, and I swap out the spring and follower post haste once an issue rears it's ugly head at the range, and fix it with OEM parts. This is my experience, and I'm not sure why I think I might be saving you some hard earned money by telling you this, but I am.
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