i am a nood to pneumatic guns and i want to know wat would b a good ammunation for my half inch barrel

one question how long did it take you to make it? because it looks really nice. whats your main ammo?

Im interested to see how you fired it. i cant tell if its a barrel sealing piston valve with a fire extinguisher tank, or if the fire extinguisher valve is the main valve.

and BTW your english ...