Listened to Dan and went to buy Co2 instead. I just dont have room to carry a pump around and I'm really anti camelbacks. I asked the shop about the bags and stuff and I just dont want to carry anything on my back.

I bought a Co2 adapter that takes unthreaded carthridges and I will buy the large supply of unthreaded from wallmart(pretty cheap).

is 12g Co2 enough to get to about 40psi?