I have tried many aftermarket magazines for the Mini-14. Bottom line is that I have found the Factory mags to be 100% reliable 100% of the time. I have a collection of aftermarket mags that work well but that is only after I weeded them out of the pile. Basically you are going to have to try the aftermarket ones and keep the ones that function and get rid (or put up with) the ones that don't. Some will work better in your gun and some will not. I cannot recommend any aftermarket ones that have been as reliable as the Factory mags.
What he said. Do yourself a favor and get some factory 20 rounders. Few if, any aftermarket mags work properly in Mini 14s or 30s. I have both and only use Ruger mags.
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