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schmanman's steel piston bb rifle

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Is it sweet?

yes, I will build one!
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Unread postAuthor: schmanman » Wed Sep 27, 2006 4:11 pm

oh, I can hold it pretty still. but, I may still add a removable stock, so it doesn't screw up how it looks. oh yeah, the compression coupling is no longer epoxied in to the 3/8ths to 1/4 inch reducer. when I got home, I found the necessary fittings (all brass) and put it on the right way. I used a compression coupling, then a flared end off a 1/4 inch brake line, with a 3/8 threaded thing. that goes to a 3/8ths to 1/4 inch steel reducer (bb's sit in there and That way they don't fall out the barrel), to a 1/4 inch brass nipple I bought yesterday.
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Unread postAuthor: POS » Wed Sep 27, 2006 4:15 pm

what caliber are those BB's ? What diameter ?
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Unread postAuthor: MrCrowley » Wed Sep 27, 2006 4:41 pm

can you get the same fittings in metal as you do PVC, e.g like a 1" 45 degree bend?
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Unread postAuthor: schmanman » Thu Sep 28, 2006 4:57 am

yes, for the most part. sometimes, even fittings that are not available in PVC. I am going to unscrew the piece of pipe the piston slides in, then smooth it with a lathe. then, I will machine a piston that has better clearances AND DOES NOT REQUIRE ELECTRICAL TAPE. every 25-50 shots, for some reason It lets the air out the blow gun, but the piston doesn't move. so I coat it with tfe paste, then it works. but that gets annoying, and discouraging. The bb's are 1/4 inch in diameter, or right around that.
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Unread postAuthor: schmanman » Sat Oct 14, 2006 6:01 pm

UPDATE:I got another barrel, and it fits spent rifle shells filled with solder perfect! put one through a old Suzuki gas tank (that someone had punched a shovel through) It was the other side, though.
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Unread postAuthor: Brian the brain » Sun Oct 15, 2006 5:21 am

ouch!!!

Nice plinker!!!
THe extended back is not my style ( just makes the gun longer, while it would work just as well when shortened), BUT I have to say it looks just fine
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Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: schmanman » Sun Oct 15, 2006 7:49 am

I just wanted something different, and this is how it turned out.
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Unread postAuthor: schmanman » Sun Nov 12, 2006 6:34 pm

UPDATE:

the bb rifle is now semi auto. I added a tee coming out from the place where the schrader valve used to be, with a gauge pointing back to the operator of the gun, and a 1/4 inch ball valve with quick disconnect nipple on it for a constant air source. I am working on a spring fed magazine. I have a breech in a different barrel made for shooting .45 cal handgun and rifle shells (they fit perfectly) the breech has a carbon fiber handle, and the hole in the barrel itself was ground out with a carbide bit on an air die grinder, then sanded so there were no sharp edges with a file and emery cloth. I added a muzzle break type thing made out of grey 1/2 inch electrical conduit. It Is incredibly accurate. I picked off a teeny beanie beanie baby sitting on a stump at 50 feet. the ammo was a .45 cal shell.

I will post pics tomorrow.
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