I have a few promag 20rd magazines that are just as good as my ruger magazines are. I bought several for very cheap and a couple of them were not very reliable but the ones I kept are excellent. I have never had a ruger mag not work well and they are very well built and will last many years and thru many thousands of rounds.
If you want to take a chance on promag to add to your mag count I say most will work just fine.
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