Yes chap sounds like a plan although my idea was to make it much more simple using a simple valve like that on a spray painting gun with a bottle of propane attached to it, then with an angled ammo box to use as the magazine and will be gravity fed basically like a paintball gun but looking much cooler. Wont use a hop-unit so it can be fed off all the waste ammo people drop around the safezone (cleaned though) and should have a rate of fire from hell so having a bit less range is probably fairer on the opposing team, and to stop bb's just rolling out the barrel will fit a sliding "trap door" type mechanism to the base of the hopper/magazine and connected to the trigger so the barrel is always empty until the trigger is held.
Not yet but im a fabricator by trade and probably have most the bits i will need kicking around the workshop somewhere so shouldnt really cost me anything except time
then it would fire BB's
