I just purchased a D60 in hopes of using it with my Scar 16 for a Carbine match. Magpuls web site states it is compatible, but when test fiting I had the same issue as a regular pmag. I filed the little bit off and now the tab that activates the bolt catch rotated around it not activating it and when this happens the mag will not drop free.
Am I missing something here? Still works fine in a regular pattern AR, but the compatibility statement on Magpul website isn’t very accurate. Sure it fits but doesn’t function properly.