I started this thread on Perfect union.  Has links to websites and threads, and pictures on identifying aftermarket Mini-14 magazines including: USA Magazines, PMI, Federal Ordnance (PMIs with no markings on floor plate), McCoy, Thermold, Ramline, Masen, Western, Scherer. Bingham, Pro-mag, Triple K, and Eagle.  Most of those are pre-ban, so it is a good resource.  I checked, and opened the page without logging in, so it should work for everyone.  I had 9 magazines I bought back in the day that I always thought they were PMI, but turns out through the resources here was able to determine that they were actually early USA Magazines with no markings on floor plate.

Hope this helps someone.

Identifying Aftermarket Mini-14 magazines

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I have a few of the Ram-Line dual-purpose AR-15/Mini-14 mags, and have discovered that Magpul Gen 2 mag springs are an exact replacement for the originals.  Still waiting to test the new spring in a Mini, as I lack one.

Those 20s are very rare.  They ar 30s cut down by Ruger to 20 round, to sell with GB models and AC556s.  I believe each came with two.

Interesting!  I did not know Ruger did any 30s with the NP3 finish.

IMHO the best high capacity mags made for the Mini 14 were from PMI.  The stainless ones I had worked 100% of the time and seemed much tougher than even factory Ruger mags.  The company itself (PMI) went out of business long ago, but every once in a while you will run across new in package ones for sale.

A quick google search found a place that is selling them (NIW) for $40 each.
https://franksgunstuff.com/product/pmi-ruger-mini-14-30-round-ss/

I had very good luck back in the day with USA Magazines in both the Mini-14 and Mini-30.  While I now use only Ruger factory 20s and 30s in the Mini-14 (though I  have a USA Magazines 40 for it, too), I still have 6 of the USA 30 rounders for the Mini-30: two nickel and 4 blued, from when I carried it s an LEO trunk weapon in the 1990s.  I also have Ruger factory 20s for the Mini-30.