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AUTOLOADING GOLF BALL GUN WITH COAXIAL GAS OPERATION |
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I had this idea a few months ago while I was tweaking a friend's automatic shotgun. I realized that the gun's gas system would transfer well to PVC. After alot of beer drinking and butt scratching, I came up with this. The design involves a 2" reciprocating barrel which moves inside a piece of 3" SCHD 80. I'm using 2" SCHD 80 collars as spacers between the two. Three spacers are attached to the 3" pipe : two act as barrel guides and one as a fixed gas bulkhead. One more is attached to the barrel and serves as a coaxial piston.
Golf balls feed throug an elbow into a 2" SCHD 80 Tee fitting sitting inside the 3" reciever. The Tee also acts as the breach. |
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Here are a couple close-ups of the gas system. The first picture shows how it sits with the breach closed. |
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Once the gun is fired and a golf ball passes the gas ports in the barrel, gas is forced through ports and into the gap around the barrel, where it pushes on the barrel's gas ring. Pressure forces the entire barrel forward, which opens the breach. |
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A reciprocating barrel makes the breach quite simple. It needs no moving parts and only has to create a seal when the barrel moves rearward. Here's a closeup of the closed breach. |
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And one more of the breach when the barrel has been pushed forward. |
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The muzzle break on the front is a cut down double-wye fitting. I'm not sure how easy that will be to find since Spears lists theirs for over $200 EACH. I'll probably just end up cutting two single wye's in half and gluing them together. At any rate, the muzzle break should, in theory, blow gas back as each shot leaves the muzzle, which will push forward on the barrel, which will keep the breach open longer, which will make the gun cycle smoother, which will make me happier.
I didn't include a few things in the model, such as a feed interruptor that will block the hopper off when the breach is open, so that only one ball enters the barrel at a time. Also not included are a whole lot of vent holes around the breach. There will surely be some residual pressure in the gun when the breach opens up, and I don't want it blowing all the ammo out of the hopper.
I've purchased the pipe and some of the fittings for this project, and I'll be working on it as time allows. Stay tuned for updates, but don't hold your breath. As busy as I am, this one's going to take awhile. |
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