Nerf gun made from schedule 40 pvc pipe. Extremely accurate and consistent if constructed properly. I was able to hit a 2x2 foot target from about 60 yards away precisely. Any further and the shot became too much of a gamble, and due the long reload process it is not advised. The gun Somewhat cumbersome so make sure you have a side arm for closer range.
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The pieces you chose to use are up to you. Everything depends on how you want your gun to function. You can add more tanks for more shots before you have to reload, or you can smaller tanks so the gun is easier to move, however your shots will not go as far and you will need to pump to a hire pressure to achieve the longer distance shots.
I personally only had two tanks (due to lack of funding) that were rather large. The gun is a little awkward to move around, but if you are waiting for your victim to blunder across your line of fire it is lethal.
The parts i used:
3/4' electronic sprinkler valve
1/2' pipe (for barrel)
1' pipe (for manifold)
3' pipe (for tanks)
2 metal ball valves
3 1' T-connectors
3 1' male adaptors
1' slip cap
1' female threaded cap (so that if i wanted to i could add another tank)
1'-3/4' male adaptor
3/4' male adaptor
3/4-1/2 bushing
1/2 female adaptor
1/2 male adaptor
2 1/2 couplings
2 garden hose rubber washer hose thingys
1 threaded car valve (so you can pump it with a bike pump or air compressor)
I personally only had two tanks (due to lack of funding) that were rather large. The gun is a little awkward to move around, but if you are waiting for your victim to blunder across your line of fire it is lethal.
The parts i used:
3/4' electronic sprinkler valve
1/2' pipe (for barrel)
1' pipe (for manifold)
3' pipe (for tanks)
2 metal ball valves
3 1' T-connectors
3 1' male adaptors
1' slip cap
1' female threaded cap (so that if i wanted to i could add another tank)
1'-3/4' male adaptor
3/4' male adaptor
3/4-1/2 bushing
1/2 female adaptor
1/2 male adaptor
2 1/2 couplings
2 garden hose rubber washer hose thingys
1 threaded car valve (so you can pump it with a bike pump or air compressor)
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Used with weighted darts/stefans like here (they have a longer range)
http://www.instructables.com/id/Make-your-own-Nerf-darts.-AKA%3a-Stefans./
Rifled barrel, maybe made of polycarbonate, which is strong, or aluminum.
Make it look like a gun, not a piping thing. Draw a design.
Mount a scope.
Install an air compressor.
It's pretty cool anyways.
one other suggestion mod the sprinkler valve to be pneumatically actuated. it increases the preformence by at least 4. i have two cannons with the same chamber but one has a normal sprinkler valve and the other has a modded valve, the modded one shoots the same projectile a hell of a lot further.
heres a link on how to mod these things
http://www.spudfiles.com/forums/modding-a-sprinkler-valve-t305.html
i made something very similar to this. I follwed this guys pictures. There aren't exactly instructions but you can figure it out from the part lists and pictures. The breech loading mechanism on this gun is awesome.