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Petg Breech


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#1 OfAllTheNerf



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Posted 07 September 2008 - 04:36 PM

What you will need:

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10" of 1/2" PVC
1 1/2" of 1/2" brass
1 foot of PETG (I'm using OMC Thick-walled)
Plumber's Goop
Small ring of CPVC
Dremel with cutting wheels and sanding bits, or other cutting/sanding devices

A air duster is also helpful to clear off all of the PVC dust.

Take your PVC and round out one end (this is the one that will be going into the coupler)

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Now make a mark 1" from that end, and then another 3" after that.

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Now mark out a dart slot.

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Cut it out.

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Now take your 1 1/2" of 1/2" brass and wrap e-tape around one end until it makes a good seal when slid into the PETG. Make it snug so it won't blow off when shot, but not so tight it is hard to remove.

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Then wrap e-tape around the other end so it fits snugly in the PVC.

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Glue it in with either Goop or superglue.

Now take the PETG and wrap tape (I chose masking tape) around it in several places so it doesn't jiggle around in the PVC too much.

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Slide the barrel back in and mark the place where it meets the back part of the dart slot.

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Take your CPVC and cut about half off.

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Goop it on at the mark.

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Now you're done! Let the Goop dry, and you should have a nice PETG breech.

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If I ever get darts that fit in PETG well for air guns and springers, I would completely switch to these. As it is my darts fit weird, so I'll still be sticking to my Brass breech's for springers, and PETG ones for air guns (one of each for my crossbow (at2k integrated)).

I'll also be selling these if anyone would like to buy them. $11 shipped for one or $8 each with $3 for however many you buy. If you're intersted please post in my Sales thread (sig) or in my Breech sales thread. Let me know what you guys think of the prices also.

Questions? Comments?

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#2 Ubermensch



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Posted 07 September 2008 - 06:36 PM

Hey, I have that exact dremel! Did the blade/cutting bit come with yours? I think I might be missing it in my set.
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#3 Z4



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Posted 07 September 2008 - 07:03 PM

Thanks, this is really cool. I too have that Dremel, or I did til it mysteriously disappeared...
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#4 Split



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Posted 07 September 2008 - 07:09 PM

ZoMg! They made two edit: Three! of the same Dremel!? And I'm pretty sure that that's a worn down reinforced cutting disk. I personally use a cordless Dremel with a second battery. A lot more control, and the grip on it is comfortable and versatile.

Seriously, OfAll, try 17/32". It fits airtight in Petg with no e-tape or anything.

Edited by Splitlip, 07 September 2008 - 07:09 PM.

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#5 Icespartan 1114

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Posted 07 September 2008 - 09:21 PM

Sweet i like this very much. Will you be selling these like you do with your brass breechs?
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#6 Silencer



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Posted 07 September 2008 - 09:24 PM

Sweet i like this very much. Will you be selling these like you do with your brass breechs?

Look at the end of his post.
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#7 nerfnut23



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Posted 07 September 2008 - 11:00 PM

I use a 750 RPM drill press with a 1/8" milling bit. A pain in the ass, but it gets the job done.
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#8 Daecu



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Posted 08 September 2008 - 04:42 PM

I've mentioned before in other posts that I'm not too familiar or skilled in the area of breech design, but would this run the risk of being pushed open by the force of the release? Most breeches I see have a twist added in as a lock to prevent this...
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#9 Aimless



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Posted 08 September 2008 - 06:27 PM

If the barrel is snug on the brass stub then it should be fine, so unless you have a really fat dart and a lot of power behind it, your barrel taking off on it's own is improbable. You can still incorporate a twist lock mechanism if you want.

Edited by Aimless, 08 September 2008 - 06:28 PM.

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#10 Magic


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Posted 08 September 2008 - 06:30 PM

I actually made a similar breech like this earlier today, but mine only consists of E-tape, PETG, PVC, and Glue. I used no brass. =/
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#11 Shrub



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Posted 10 September 2008 - 03:26 PM

Yeah I thought of making one without brass but I don't have dremel and I've heard 1/2 brass doesn't fit many peoples darts. Also would a breech be cheaper without the brass?
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#12 Galaxy613



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Posted 10 September 2008 - 05:25 PM

IIRC brass is measured by OD unlike PVC ID. 1/2 brass thus has an OD of 1/2 which means it has a ID of about 7/16 or something like that.
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#13 jwasko



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Posted 10 September 2008 - 06:05 PM

IIRC brass is measured by OD unlike PVC ID. 1/2 brass thus has an OD of 1/2 which means it has a ID of about 7/16 or something like that.

That is correct, if my measurements are correct; My 17/32" brass has an inner diameter of 1/2" and an outer diameter of 17/32".
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#14 needak



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Posted 10 September 2008 - 06:48 PM

where do you get petg?
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