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Pex/pvc Breech

I think this is new....

Started by Guest_DarkInfection_* , Jun 29 2007 05:21 PM

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#1 Guest_DarkInfection_*

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Posted 29 June 2007 - 05:21 PM

Whist brainstorming for ideas on a totally original/ new breech system, I thought up many, many systems. After browsing through the plumbing section at Home Depot, I found out that FrostKing brand 5/8 FBR fits perfectly into 3/4 PEX tubing, and PEX tubing sizes fit (almost)perfectly into one another, just like brass. I came up with an odd, fully functional breech system, that utilizes shells, and those totally kickass mega stefans. Here it it~

Shot with Canon PowerShot S10 at 2007-06-29

That is the whole setup, showing- A) The two-part breech setup B The stefan and it's shell, and C) My mAd SkIlLz at using PVC Primer/Cement.
(Edit: Damn that stupid smiley with sunglasses.)

Shot with Canon PowerShot S10 at 2007-06-29

This is a close-up on the gun half of the breech. As you can see, there is an o-ring, and two sizes of PEX tubing in this part of it. I will later explain with words and pictures, how this all works, if you haven't figured it out already.

Shot with Canon PowerShot S10 at 2007-06-29

Here is the barrel part of the breech. The barrel, consisting of 11 inches of 3/4" PEX tubing, is housed inside of an 18" length of 1" PVC. It is centered, using E-tape and Duct-tape. There is obviously a hole cut into the PVC, which is where you load the shells.

I will now attempt to explain the process (refer to ALL of the pictures for reference.)

First, you load you shell with one mega stephan, next you will load the shell into the breech of the barrel half. After that, connect the two halves of the breech together. Doing so will result in the smaller sized PEX tube, push the dart into the main barrel. The two o-rings, seal the shell with the barrel, and the other half of the breech. Next, prime your weapon, in this case I will pump up my simple ball-valve homemade (pump not shown.) Lastly take aim and fire.

Here is a final picture of the "closed" breech. It shows the shell, connected with the main barrel, and other half of the breech.

Shot with Canon PowerShot S10 at 2007-06-29

I hope that my descriptions weren't too confusing, I will try to clear up any questions you might have. Also, I am trying to think of a magazine that would work with this. Right now, I think I might just build one out of balsa.

Edited by DarkInfection, 29 June 2007 - 07:51 PM.

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#2 newby

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Posted 29 June 2007 - 05:50 PM

I think that adding a magazine would be next to impossible without a shell ejection mechanism. Maybe I'm missing something here, but there isn't an ejection mechanism is there?

~NEWB

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#3 Guest_DarkInfection_*

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Posted 29 June 2007 - 06:39 PM

You eject the shell by simply disconnecting the breech, after firing. Remember, there are two parts of the breech, that connect to each other.

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#4 NerfMonkey

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Posted 29 June 2007 - 06:53 PM

The right spelling is Stefan. Just thought I'd point that out.

That's pretty nifty. If you loaded a shell with shotgun darts would the pushy thing still shove all of them into the barrel or does it leave the last 1/2" or so of the dart sticking out the back? If it pushes it all the way in this would be really useful with shotgun darts.

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#5 Guest_DarkInfection_*

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Posted 29 June 2007 - 07:32 PM

Oh, whoops. I'll fix that spelling as soon as I can. and yes. It actually pushes the dart in a little further than the very end of the barrel. So shot-gunning would defiantly be possible.

Edit: Also, you could shot-gun with multiple FULL darts too.

Cycle as follows-

1. Load a shell into disconnected, barrel-half of breech.
2. Connect both parts of breech.
3. Disconnect breech, and repeat the cycle.

When I get a working magazine on there, all you would be doing is disconnecting, and re-connecting the breech. But since I don't, you have to manually load shells. As stated in the first post, dis-connecting the breech automatically "ejects" the shell. The empty shell merely falls out of the barrel half.

Edited by DarkInfection, 29 June 2007 - 07:44 PM.

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#6 PointBlank

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Posted 30 June 2007 - 08:41 PM

Nice homemade. Keep up the good work!

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#7 jwasko

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Posted 30 June 2007 - 10:49 PM

So, just to make sure I have this right:

Your barrel is 3/4" PEX.

The shells are 3/4" PEX.

The "other" side of the breech (toward the air source) is 1/2" PEX.

In any case, good job on finding the telescoping nature of PEX and coming up with a breech that utilizes that nature.

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Pex/pvc Breech

#1 Guest_DarkInfection_*

#2 newby

#3 Guest_DarkInfection_*

#4 NerfMonkey

#5 Guest_DarkInfection_*

#6 PointBlank

#7 jwasko

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