My Colt 1991A1 has started to lock the slide back with the last round from the magazine being partially chambered.. This is with 230gr round nose bullets. Dont know if this a magazine problem or not.. The gun has less than 2000 rounds thru it..The photos show the 2 factory mags that came with the gun,, They have different shaped followers? One is flat and the other convex. It happens with both mags about half the time..
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