so i came up with this and man it is scrary!! (i also tripled the barrel lenth on my burst disk. (v2 now has a tail and an extra sharped nut to increase aerodynamics
original

V2


i took a bolt sharpened it on a grinder than got 3 nuts and a washer and sharped them.
with 2 layers of aluminum foil (about 50 psi?) i shoot this though 3 soda cans and it kept going like 10 yards.
the hole

the cans






