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PVC/CPVC Breech


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Author Topic: PVC/CPVC Breech  (Read 370 times)
iamthatcat
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« on: February 28, 2012, 01:04:55 pm »

Here are a few tweaks to the PVC/CPVC breech. I added a wire dartstop and shrunk the dimensions of the loading slot. The locking lug has no tab or handle. I use the barrel to open & close it. The opening is .45" wide and 1.6" long. It starts .53" from the end of the sleeve. I cut a bit off the front of my PVC couplers. You may need to start your slot further forward. The sanded area of the CPVC is 3.8" long. The PVC sleeve is also 3.8" long.



I sanded the CPVC barrel to fit inside the PVC sleeve. I started with 60 grit sandpaper, wrapped around the CPVC.  Use several different motions, alternating regularly. There is less chance of the sliding area turning out irregularly shaped that way. I alternated combos of hands, which end I held, up & down or twisting motion and grip. I sanded until it started to fit. I then went up through a few grits ending with 240. One trick is to cover each end of the sliding area of the CPVC with duct tape to avoid making those areas too small. That would leave a leaky breech. Just remove the tape from time to time and sand those areas separately. Once it was done I went over it with a manicure sanding sponge to give it a smooth surface. It should take about 1 1/2 - 2 hours to sand. I probably spent as much time sanding with the rougher grit as I did with the finer.



Here I fit the dartstop. I used a finishing nail I found in my parts jumble. Measure, mark & cut it carefully to insure that it does not stick out past the PVC.



Melt that down into the end of both the sleeve and barrel until it is sunk in. I used a 30 watt soldering iron. I held it in place for a minute while it cooled down.




Undo everything and clean up the burnt plastic. Mark the area of the back of the barrel that needs to be removed. This will allow the barrel to spin a bit, letting the locking lug sink into it's slot. I removed the material with a file. Glue the nail in.




I made the locking lug from some scrap PVC electrical conduit. I cut a small chunk of material to match the width of the opening.




Now mark the barrel for the locking lug. Pull the barrel out and file a notch for the lug. Go very carefully here as the location of the notch will determine how tight your breech seals. A tight fit will ensure a strong lug. Cut the lug to size.





Next I marked, started and filed a small slot for the locking lug to mate to. Test fit the lug to make sure that everything is tight. File and fit the lug, slot and rear mating surfaces carefully. Clean everything scrupulously. Make sure to position the lug so that the barrel will rotate properly in the slot. Glue in the lug with epoxy or solvent weld it in place. If need be the lug can be dremeled away for servicing, replacement or adjustment.





Grease it up well.



Pop it on your blaster and give it a whirl! I added a piece of the NF's stock barrel as a front sight.



It opens 1". There's an additional .75" to jam the dart into before the dartstop. I pretty much matched the opening size to this blaster. A breech for a BBUMB would need to be made longer I guess. Here it is with a 1.4" dart loaded.

« Last Edit: February 29, 2012, 01:12:02 pm by iamthatcat » Report Spam   Logged

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« Reply #1 on: February 28, 2012, 02:33:17 pm »

Did you SMELL the melted PVC? Nasty, right?
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« Reply #2 on: February 28, 2012, 03:15:04 pm »

Oh God! What is that smell? It's like nothing else. Feet + bad chinese food?
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« Reply #3 on: February 28, 2012, 03:31:28 pm »

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Quote
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« Reply #4 on: February 28, 2012, 07:40:28 pm »

Dude, you have mad sanding skills. This is really cool. A lathe would be a good tool for you. Have you ever thought about using 1/2in. Poly Pipe? It already fits 1/2in. CPVC airtight, you just need the tab and the dart stop.
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« Reply #5 on: February 28, 2012, 08:36:46 pm »

1/2" Conduit also slides over CPVC rather smoothly.
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« Reply #6 on: February 29, 2012, 04:19:23 am »

Thanks. I wish I could get any kind of real power tool. Apartment. But I am thinking about a big "quiet box" like SGNerf has.

Nah I didn't know about poly or conduit! Cool! I gotta do a McMaster order and Lowes run soon.

I keep wanting to try clear Polyester. McMaster is confusing as S**T though. Gotta browse on a good level-headed day. Lol.
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« Reply #7 on: April 22, 2012, 05:26:16 pm »

I added a quick foam seal to mine when it came time to clean & tune my nf. I pressed the breech into the foam to mark the outside edge of the seal and cut out the circle carefully. I didn't trim out the center at this point because I have had problems with doing that in similar situations.



I used gel superglue to adhere it, being sure to get good coverage. I pressed down on it and wiped away the excess glue.



Lastly I cut out the center out with a razor blade and cleaned it up with a file. I added some grease to the whole breech for good function, as well as improvement of the seal.



It improved the seal enough for the plunger rod to slow down more than usual, and even crawl to a stop near the end of it's travel (which it didn't do before).
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