What are the odds it is the mag spring thats worn out?
From another site:
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If it's only happening with that 8 rd. mag it is almost certainly the mag spring has weakened and is not getting the last round up fast enough. A rough or tight extractor can make it worse, but if your 7 rd. mags work 100% the extractor is probably within specs. 8 rd. mags really need an extra power spring if they are used with a full 8 rounds all the time. Squeezing that last round in there overcompresses the spring. (and the follower) The 8 rd. mag is a design compromise. I have never had any problems using 8 rd. mags if I only load 7 rds. in them.
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