Well, yes: Deparent the turrent, use movemesh to offset it from its 0,0,0 again, reparent it to the tank or whatever it is.
That if it is pure mesh
Simpler: use bones, attache the turrent to a bone and findchild the bone (can be freefloating) and rotate that one :)
That if it is pure mesh
Simpler: use bones, attache the turrent to a bone and findchild the bone (can be freefloating) and rotate that one :)