i did not see that rule and i should have seen it. However i found it relevent and it ansered his question. Had i seen or read that rule i would have not ansered in such a way.

Now all i know is that i used a 20$ daisy spring powered rifle(crap). i killed a bird from about 9ft away i just aimed for the face since i knew the bb wouldnt penetrate to the heart.

i beileive it on spudtech.com but for some reason i cant get on but i am sure he sells them there.

I am confused on what type of pneumatic it is, is it a piston?

Oh yea, what is that inpression in the back of your piston?

Its gonna have to have a kind of big power source for a good launch from four barrels.

I just thought maybe since its his first maybe he isn't capable thats all it really depends on his budgets and knowledge i guess.

Now i am not getting what you are using as a mold just a pvc pipe right?

Well if its his first he really should start out with a ball valve. Pilgor your first cannon is not gonna be your best obvouisly so work from basic up.

One of the key things to having close to a flatline trajectory is having your projectile aerodynamic, and evenly balanced.

LOL I did not see that.

Well I did misspell may and put my.

Are you speaking to me?

A hand held my require a coaxial piston.

geez guys hes just trying to build a simple pnuematic you dont have to hard on him he even said hes a noob,