Quote Originally Posted by greenwayjames View Post
Very nice and well made. Lots of potential. Similar in many ways to the 19th century Bussey and that had a surprising turn of power for what it was. It would be good to see a modern equivalent but with safety precautions
I do wonder what's to stop the trigger being pulled and the piston hitting the half open front end of the gun, or a finger. Maybe the clearance could be tweaked so the cylinder wall itself was virtually touching the piston face as it swung up, thereby blocking it's escape route (and no chance of getting a finger in the gap).

The real design problem though is no mechanical advantage on cocking.