UPDATED TODAY: Schmanman's steel piston rifle

[schmanman]

this thing works so good now! this piston has lasted for over 100 shots, and is still going strong! this sucker is so accurate that I shot a stray paint can out of a tree from 50 feet away, just sighting by eye, no scope or anything. I shot a nail into a pre-drilled hole from 20 feet awa, the hole was about an eighth inch diameter...

at about 120 psi, it shot an unsharpened nail through a fileing cabinent door, from 15 feet away, no problem. those are not thin, beleve me.

it also shot nail after nail through a fireproof cabinent made of 16th inch steel, no problem.
I put a sharpened pencil through a piece of 1/2 inch plywood.
it make my hand bleed from a dry fire (metal shavings from a recent modification)

I'll post some vids..... eventually.....

and I'll paint it flat black or olive drab



the stock looks much more shiny in person, it's chrome.




the double length "sniper barrel" (I like the short one better)



the piston...





the sharpened nails I shoot every once and a while.....




the adaptor I made so I could fill it up with a bike pump, or a compressor





without the adaptor

[Velocity]

Haha I think its the same picture every time... but that stock looks beautiful.

[schmanman]

thanks!

ok, it's fixed.

the stock is part of a exaust heat guard from a 70's 125cc suzuki enduro, slightly flattened, and cut in half, with part ground off.

the part on the very back of the stock is a peice of plastic from the inside of a handdgrip from a clutch (the plastic part the foam's on) with a slot cut in it.

[cwazy1]

lol why are all yours fittings rusty and nasty?!?

[schmanman]

because it actually gets used, and most of the time is stored out in the barn. It'll look better painted.


none of them have dirt or rust on them, it's the combination of pipe wrench marks, old paint on some fittings and not on others, and the combination of black steel pipe and fittings and galvanised steel pipe and fittings

[DYI]

Schmanman, that "sniper" barrel looks a bit bent

cwazy, schmanman's piston rifle has never looked new, not even when it was new. I suspect that it's built out of mostly old parts that were lying around.

I'm glad that you finally got a decent looking stock on that thing, and look forward to seeing the SWATv4.0, whenever that happens.

[Novacastrian]

I like you cannon very much, it looks like it could handle some serious pressure and should look even better after you paint it olive drab.
Maybe even a simple camouflage.
Nice work with the adaptor too.

Edit: DYI, that barrel is for long distance shots i suspect

[Mitchza89]

That gun looks absolutely tops mate. Job well done. Question though....What the hell is the piston made out of?

[schmanman]

thanks...

my grandpa has a bucket of pipe parts he god from scrap cars on the rail road. the fittings, like the tee the valve is in, are off high pressure lines from the general motors plants and facotries in pontiac and detroit about 50-60 miles away. they are very thick, and rated to extremely high pressures. and there are some new ones on there too.


EDIT:

thanks guys!....

the long barrel is really nowhere near as bent as it looks in the pictures, it was the angle I took the picture from, and that barrel is mostly used for distance shots. nice guess..... 8)

the piston is made from a rubber cap they put on high qualty steel dowel rods at some specialty places, which is a extremely hard rubber/medium hard plastic, wih a 9 mm diameter spent rifle shell inside for ridigity, wrapped in hockey grip tape untill I find time to cast epoxy around it to replace the tape, although the thap has worked awesome so far.



Jack! notice, no feet in the pictures!!!

[elitesniper]

thats really nice, does that piston leak through the barrel a little?

[Skywalker]

Nice! I've liked all the re-incarnations of this gun so far. How do you get the barrel to pass inside the T for the piston to seat against? (I'm thinking about working in steel for the first time, so I'm looking for pointers.)

[mopherman]

Nice! I've liked all the re-incarnations of this gun so far. How do you get the barrel to pass inside the T for the piston to seat against? (I'm thinking about working in steel for the first time, so I'm looking for pointers.)

Usually when working with threaded pipe, you screw a small nipple into the "wrong" end of the reducer for the piston to seal against. Some people also use dilled out compression fittings. You could also make a short, "toolies style" pisto that seals against the back of a reduce bushing.

[Carlman]

noice one mate! I was thinking of making a steel gun soonish so this gave me some ideas...

I love the stock also

[TwitchTheAussie]

All I can say Holy F*cking Sh1t thats nice

[Pyro Ninja]

Nice..
The piston looks like its made out of a small tap washer.

Pretty good quality for a mobile pic