I own a post war Mauser(06/73) and had a problem like you describe with one Mec-Gar mag in it. On close exam, the hole for the mag catch to go into was "off" just a tiny bit, and the mag catch would not fully go into the mag hole. I took a needle file and opened the hole in the mag to accept the mag catch.....it required very little filing.
Compare your Mec-Gar mags to your functioning mags, and you will most likely see a tiny/small difference in the mag catch hole. Modify as needed. Good luck!!
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Need DWM breechblock #21
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