Four or five hundred through mine with no mag problems other than some stickiness inserting fresh mags in during the first 300 rounds. The only failure of any kind I've had was getting the slide to go into battery on a mag of 200 LSWCs, and that was only one time. I'll probably stick to RNs (or HPs) in the future but all the rest of my SWCs have shot fine, maybe 150 of them without any but that one problem.
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