Beta Project Pmags are SHITE if you going to get Pmags go for the PTS Pmags M version 120 rounds, they avrg around 20 - 25 bucks a piece but they are worth it since they are super sturdy and I've dropped them countless of times and they don't break
dunno but KA never worked in any of my guns Ive owned so i wouldn't use that but try CLassic army midcaps they work great and G&P should be decent also