Not to bad needs a bit of a tidy up round joints

Place one water baloon inside another doubleing the wall thickness this shoud withstan the pressure of launch

It all depend there are different classes of steel pipe with different amounts of iron in them class 1 pipe is the best as it is cast straight form the steel works and is capable of holding an easy 1000psi class 2 isnt near as good u can usualy see where is has been welded together and has a higher ...

I have a pretty basic marble gun i shoot it at 110psi and some new ammunition i have found that shoots awsome is 15mm thread bolt you can get them in 150mm lengths they go awsome bit of weight in them too ya can cut them to any size you want witha grinder i got one and welded some nailes to the top ...

Guys some awsome suggestions there im just waiting to get some parts pressure tested and pressure welded im ganna ut a twist in the star picket to make it spin

Really good cannon but yea use pressure rated parts its a bit safer the valve etc is exelent
Collo

Great cannon mate love the trigger design and the general cannon itself ya should throw a movie and some damage pics on to
Collo

Thanks mate im starting construction soon just getting some final parts etc thanks for your imput i will be putting pics and movies on hopfully.
Collo

Hey How use going after i made my first small marble gun i've decided to upgrade im starting construction on my star picket gun i have about one and a half foot of class one steel pipe rated at well over 1000psi. This piece of pipe will be my compression chamber a larde backing plate will be pressur...

yea im using my dads blow torch so it should do it thax for the fumes warning

ill heat it on a fire will coal and make moulds in sand
that should do it i think

I actualy have some lead on its way my friend is giving me some so i thnk i will look into some lead ammo thx

Ya i ave been working on some foil cones and im lookin to get some plastic ones but a small piece of fishing wire on the back should make a difference.

Yea som of the ones that i made bounced off but didnt rebound far enough to hit me so they are awsome ammo thx

all awsome idas im trying nails at the moment Thx Guys