While the performance of the high explosive (HE) warhead was impressive, the M18's 57 mm HEAT round was slightly less so, only about 76 mm of armor penetration at 90 degrees, http://bulletpicker.com/pdf/OP%201720,%20Shape%20Charge%20Ammunition.pdf http://www.lonesentry.com/manuals/recoilless-weapons/ compared with the M6A3 rocket for the Bazooka which had a penetration of 100 mm.