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Yes, according to the manufacturers everything is supposed to be compatible, the lower is strictly for colt mags and the BCG takes either Golck or Colt mags. I might just try different colt mags to see what happens.

Hi, i just finished building my 9mm ar, i used a Spikes Tactical 9mm lower and an Aeroprecision 10.5 inch upper with a KAW 9mm BCG and colt mags. The issue i am having is that when the bolt goes back and ejects the spent shell it moves the next round in the mag out of position thus creating a...