do i (A) bulid in a fake recoil and sound
or (B) make it actualy fire
the first idea is simple build it to look like it fires, and try get a sound system to work in time with the henglong elecronics etc??..
or use the vast aray of live fire choices. The one that pleased me the most is a simple electro magnetic coil gun' quite powerful tool' and not many moving parts? ....or theres air soft
... and of course theres Co2 power??anyone know of another way to make it fire!! i made a small (potato gun) with some simple tubing hairspray and a sparker' and as amusing it is to see a flash fly out the barrel with a little foam projectile, the reliability is an issue
but i really have an itch to get it to fire something
....i think after much serching etc i will go for a good quality airsoft gun and fit that 
....should be enough for my needs....for now 