These are mag springs that I am speaking of. Most got so they wouldn't feed the last round reliably. Some would have a round nosedive. These were mostly on older NFML hi cap mags that I purchased used so I don't know how many rounds thru them. I have a total of 18 HC mags for my Glocks now. For replacement I use Glockmeister mag rebuild kits (don't know which brand spring the kit contains but I suspect Wolff) and Wolff+10% springs.
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