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Hi Jeremy, yes sir, these will work with the PTR91. Not sure about reliability with this brand, but you can get H&K mags here >>> https://gunmagwarehouse.com/heckler-koch-hk91-g3-308-20-round-aluminum-magazine.html Stay safe & have a great day!

yes they will work just fine

Hi Jeremy and welcome. Yes, I have used Thermold magazines and they have been reliable. Cheers and stay safe!