SpudFiles

Sorry for the lack of pictures(I will put some soon i hope.) My gun basically has a carved stock and looks like a musket. I have scrapped the piston idea for now and returned to old technology. its a 50 cal marble gun that can shoot at 3 yards range into 26 layers of cardboard and 2 magazines. It uses just a spring opend ball valve and a large airchamber(thin) and a ball valve the same sixe of a marble. since it opens slow compared to a piston i jam marbles really tight and they can shoot into a 3 inch plywood.

Its funny that the actually impact is SO much louder than the gun that I barely shoot it. When you cock it then pull the trigger you hear a satisfying -ping- then a sharck crack and then a thump or bang the sound of a bomb going off when the marble hits. Mind you this took me 2 hours and it can do that at only 120 psi. im gonna use it up to 300 psi. Is there any way of measureing muzzle velocity from its penetration into card board. Remember it shoots throgh 26 layers wich is about as long as your wrist. I stuck a pencil through the entry and it only went through about half way from the exit! not bad for a £20 pound easy to build airgun i'd say! also the recoil is very large because of how fast the ball valve turns and hits the stopper it built.

Do you think this thing gets about 400 feet persecond? Ive always been fsinated with the napoleonic and american civil war. I dont want TO much power because i live in wimbledon london and i dont want my nieghbours to call the cops.

Sounds good, alot like my first cannon, Spring loaded ball valves are more powerful than people who haven't tried them think.

I would hate to live in London....I was born in Derby, hated that to, but I know live in Devon, and its great, I have around 30 acres of land to spud on, and no one can do a thing about it because its my land.

Wowow that block of text is near unreadable.
Would you mind to split it up in paragraphs?
If you want many people to comment your gun you will need at least a clean and readable post, or you have to add some pics.

how fast do you think im getting it?

and they can shoot into a 3 inch plywood.

Excuse me for being a little cynical, but...[/quote]

No idea, give us a guess at the weight of the marble and the dimensions of the barrel and chamber.

If you're wondering if it's in a legal power range I can tell you for certain it's not. You could throw a large marble with 12ft/lb of energy

i would rather like some pictures.

shure.

MaxuS the 2nd, I never said it can shoot through 3 inch plywood it can imbed itself in it. Also i tested it at 350 psi with an even faster turning valve. Holy sh*t................................I fired at point blank and the marble ploughed through 54 layers of thick cardboard. Damn.

I will take pictures with my phone- although it will be bad quality i will show you the tunnels it made. I took it to a field and fired it with a yellow glow in the dark marble at dusk. I didnt see it but I heard a wierd screeching noise. Im pretty scared of a misfire. With 1/4 inch paintballs it can shoot through 3 layers of cardboard at 30 yards. With bbs and homemade mine balls the will shoot into absolutley any thing. There is a pine post proped against my garden fence full of holes.

a picture is worth 1000 words *hint hint*

would LOVE to see some pictures of this, mate...
I am making the exact same thing myself now...