[raketenjagdpanzer]

the M60 had a cupola-mounted .50 cal, controlled from the inside. The M85. They were also mounted on LVTP-7s.

The thing wasn't fired with a trigger, but rather a pull chain that actuated a solenoid. It was incredibly unreliable, and if you had to clear a jam, had a tendency to fall to pieces, usually with one of the springs in the gun firing important parts all over creation.

Infantry versions with spade grips were tested, to replace the M2, but they were widely hated.

Oh, and the ammunition linkage (despite the rounds being .50 cal) weren't compatible with the M2. I heard that the military still had a few million rounds sitting in storage, but that could be apocryphal.

But yeah, that thing sucked.