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Hi Joe. Yes, this is a 10mm 15 round Generation 4, Drop Free Ambidextrous Magazine. (Mag Release slots on both sides). Cheers!

Joe, yes sir, this has the magazine release cutouts on both sides. So it will fit Glock 20 or 40 in any gen including gen 5 with the mag release on the left or right side. So this will fit and function just fine. Hope this helps.