This is one of my first pneumatic cannons I've made, I tried to build on a budget and ended up spending a reasonable amount of twenty-two dollars. The stock is made fully out of 3/4 in. sch 40 PVC pipe and fittings with a pressure gauge and threaded valve stem.The firing system is a rainbird cp-100 1 in. modded sprinkler valve that is pressure rated for 120 psi.This pneumatic cannon has two detectable barrels,one with a .40 caliber barrel sleeved in a 1/2 in. PVC pipe with a breach loading system the other is a regular 3/4 inch barrel that's about 4 feet long.some of the ammo i use is .40 blowgun dart,triple a batteries,nails,and homemade scatter shots either filled with airsoft bbs or 5 marbles.
Fully assembled air cannon
Modded sprinkler valve
breach loading system locked
breach opened
stock/air chamber
Some damage shots!!
This was shot with a penny slug about twice.
shot a dart from about 5 feet at a penny taped to half inch plywood.
Pepsi can filled with water inside a soup can inside a tomato sauce can that was shot with a metal marble.
... Good clean build and nice breech load system, though you should cut out some of that pilot volume.
