I believe the new SLU unit has the capability to operate 2 guns simultaneously That would help with recoil and battery of the guns. Futaba i think now has an adapter for one of their servos to make it a linear action. This would greatly simplify the recoil. I believe they are intended for micro size servos which is even better. I think Tower Hobbies has the servo adapter listed. It has been some time since i saw it so i may or may not be mistaken by the maker of it, but there is definitely one available.