"Please"
You have to save the tank and reload it a couple of times until the cannon fire is not a random color and for it to work properly, otherwise the cannon will loose its spring.
I took the cannon from the apocalypse tank and put an proper abrams skin around it the 50cal is from the commanche helicopter if thats spelled correct, a little sketchy when hitting bumps but overal works good.
work cannon- w=up, s=down, f=fire
work 50- z=down, x=up?, q=fire
tank- left,right, you know the rest
P.S. the tank has a horrible stabilizier. if you keep the cannon bounceing i will stabilize ok
have fun.
if you get all this down it should work really good
if have problems let me know and i will help you.