[QUOTE=_NPR_]Theres prolly a very good reason why not.. but..

If you can use a pump to pump up a precharged rifle, or some sort of rifle
(see I'm new to all this)

Why isnt there a special co2 capsule that has a 1 way valve, like on a lighter or something, that basically you could pump up using a pump, then when you put it in your gun the seal would be pressed again and it'd release the pressure.

Ok so it'd be air, and it wouldnt last as long.. but air is free..
QUOTE]

Hey guess what someone has already done the drawings for you to make one for yourself, hit this link and then go to the section marked 4 REGULATED AIR CAPSULE :
http://images.google.co.uk/imgres?im...3Doff%26sa%3DG

M@rk..