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Hi Danny and welcome. Yes Sir, the RIA DY9 accepts Glock Pattern Magazines. https://www.gbgunsdepot.com/post/rock-island-derya-arms-dy9#:~:text=The%20DY9%20accepts%20Glock%2Dpattern,may%20also%20accept%20some%20parts.

Hi Danny, yes sir, this will work in the DY9 >>> gbgunsdepot.com/post/rock-island-derya-arms-dy9#:~:text=The%20DY9%20accepts%20Glock%2Dpattern,may%20also%20accept%20some%20parts. Stay safe & have a great day!

yes those mags will work just fine