[John Sukey In Memoriam]

If you have a tank or something that takes BIG ammo and has wheels, thats what the No42 scopes were made for.
It appears, as has been said that the shorty is actualy a smoke discharger. Remember the JAWAS zapping R2D2 with one of those?

 

[John Sukey In Memoriam]

If you wanted to take that further. SMLE and Long Lee actions were also used to set off the Stokes "Toffee Apple" trench mortars in WW1