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Issues with one STI gen1 Mag 40S&W

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All of my mags have always dropped free until recently. An empty tube will drop free but the second you chamber a round or fire the gun I think its sliding one of the bottom rounds out far enough for it to catch on the inside of the grip. Has anyone else had this issue? Whats the remedy? I don't see any visual difference. 

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On 11/14/2020 at 6:43 PM, AndyG said:

If anyone has this issue in the future new mag springs fixed it. I’ll start replacing them every off season.

I usually swap out springs annually. I also use a heavier spring in my mags with allow longer life and won’t have the issue you’re having. 

I think it’s your spring. There isn’t e Pugh pressure on the follower to push the mag out of the gun. 

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