Practically speaking a UAV carrying a gun would need to use electrically fired or rocket cartridges, and be as recoil-less as possible. Perhaps using something like a rocket pod to fire .50 caliber rockets.
25 posted on 04/25/2012 11:57:22 AM PDT by yefragetuwrabrumuy
("It is already like a government job," he said, "but with goats." -- Iranian goat smuggler)