15mm BESA on a ground mount. Interesting as it shows the scale comparison to men.
Imagine being wedged into a Vickers turret with that thing
I wouldn't be that bad, Looking at the gun in my edited picture, the trunnion is inside the green circle, and everything inside the blue circle would be removed, as this only seems to be needed for the tripod mounted version.
and on the tank, again, the trunnion is inside the green circle, so there wouldn't really be that much of the weapon inside the turret . . .
cheers,
Robin.