The Bushmaster IV is an automatic/semi-automatic cannon designed and built by Alliant Techsystems. The Bushmaster IV is based on the M242 Bushmaster and Mk44 Bushmaster II originally developed by Alliant Techsystems. The ammunition the Bushmaster IV will fire includes Bofors 40mm L70 3P (Prefragmented, Programmable, Proximity-fuzed), APFSDS-T Mk I...