 The inner pair of machine guns had 400 rounds per gun, and the others had 270 rpg, for a total of 1,880.The B/C subtypes' M2 guns were mounted with an inboard axial tilt, this angled mounting had caused problems with the ammunition feed and with spent casings and links failing to clear the gun-chutes, leading to frequent complaints that the guns jammed during combat maneuvers.The D/K's six M2s were mounted upright, remedying the jamming problems.