a pneumatic sniper rifle.
surprissingly accurate.

Step 1: Materials

in this project i used;

1 coke bottle
2 valve from nerf gun
3 bike tire valve
4 curtain rod
5 tape
6 spray paint (optional)

Step 2: Chamber and Cap

drill a hole in the cap just big enough for a snug fit for the bike valve.

drill a hole in the back of the bottle and fit the tube from the valve to the hole

Step 3: Barrel Ammo

i used a peice of curtain rod with duct tape for a barrel.
but u can use anything that will fit
put the other end of the valve into the barrel and snap it in place

try and make some darts that fit. i make some out of peices of entenne and sock