The cupola mounted .50 introduced in the M48A1 was a nightmare to operate. The M48A5 series opted for a hatch and flex 7.62mm /.50 cal. mount akin to Israeli mods to their M48/60 and I was envious of it. Of course the cupola was a response to the considerable casualties to tank commanders in the Korean War, but the handicaps of the 50 rd box and position of the gun in the cramped cupola could only be termed grotesque. Most of us can remember to this day the few times we were able to fire a 50 rd box, reload with another box and fire that one too, without stoppage or worse.
As for the gun shield for the .50, if you need it you probably should be using a different weapon!
Edited by Ken Estes, 06 December 2014 - 1659 PM.