Continuity mistake: After Superman pushes Doomsday away once he breaks from the ice, Doomsday charges again, swinging a punch which Superman jumps aside to avoid. In that shot you can see the tank next to them and the .50 cal gun mounted on top of it. Then Superman retaliates and lands two hard punches on Doomsday and the camera cuts to a side angle, and suddenly the .50 cal has vanished off the tank.
Picture added by Quantom X
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