I had a similar experience with Stoeger OEM mags that i purchased from CDNN. I purchased 3 of them (1) one was perfect and went in and out without problems. (2) Second was slightly snug, but a little bit of work with some 320grit followed by 600grit...no problems. (3) Third was really oversize. Once I figured out exactly where the problems were, I used a bit of vice squeezing, and some file work, followed by the 600 grit. Now all three mags go in and out as they should, and function perfectly.
It appears as though quality control was a bit lax on Stoeger OEM mags.....perhaps that is why they were so reasonably priced.
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