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Argoms
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Joined: 26 Aug 2012
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Post Barrel Materials  Reply with quote
I've found some ABS and butyrate tubes from this site that can be used as barrel materials.

ABS is very slightly cheaper (approx 0.3p per cm less than butyrate for 15.9mm OD), but only comes in plain grey. Meanwhile, butyrate comes in a variety of colors- I ordered white, blue, red and green (green is slightly translucent, unlike the others. It's my favorite out of the four). Butyrate is slightly smoother and flexible than ABS (but still quite rigid- I could use the 71cm entire length as a barrel without any bending issues).

Unfortunately, the tolerances aren't high enough for nesting (without sanding) sizes of tube within each other, but are still much better than PVC's tolerances. 12.7mm ID (15.9mm OD) Is a good (long barrel) springer fit for stock darts- they fit my streamlines almost perfectly, but there's no resistance when I push them in. 15.9mm ID (19.1mm OD) is good airgun/high diameter springer fit with a vacuum effect similar to 9/16 K&S brass on stock darts.

According to my (very quick) calculations, this stuff is about half the price of brass (admittedly, not saying much) while giving you a good-tolerance barrel fit (down with PVC! D: ). Could be a nice brass substitute as long as you're not looking for the airtight telescoping effect (will update with news on that, and machining some time over the next few days).

Butyrate:
-Smoother
-RAINBOW COLORS
-Shinier

ABS:
-Very slightly cheaper
-More rigid
-Comes in longer lengths (910mm compared to butyrate's 710mm)

(both use share at least once solvent, which I also have...)
The shop itself was nice, delivery was on time (2 days) and products undamaged. They also sell brass tube along with some other stuff I may experiment with some time (gears, motors... Homemade stampede? Surprised). The ABS sheet looks around as expensive as polycarbonate (seems to be a trend in the UK in general though :/), might not want to get any of that.

Topic moved

UPDATE 1
Turns out that you can squeeze a few cm of the smaller tube into the larger one. Might be useful for transition barrels or removable attachments/joints, but standard breech designs are out of the question for now.


Last edited by Argoms on Thu Oct 04, 2012 7:20 pm; edited 1 time in total
Thu Oct 04, 2012 2:54 pm View user's profile Send private message
UKNerfWar
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Post Reply with quote
Thanks Argoms. This is just the sort of topic we really need on here. I think we should expand it to become a database for good barrel materials.

If anyone has any good materials they'd like to share, post them here.


This is my offering.

This is clear acrylic (perspex) tubing and it comes in 500mm, 1000mm or 2000mm lengths. It is very rigid and easy to work with.

I measured the ID as 12.86mm which is 0.2mm larger than my CPVC from the states. This means that the dart fit is actually better than CPVC for streamlines although it is still a bit of a twist fit in most cases.

The other bonus of this stuff is that the OD is 15mm so works with all 15mm plumbing fittings.

Not to mention that it's clear which adds to the awesomeness.

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Thu Oct 04, 2012 5:31 pm View user's profile Send private message Visit poster's website
Argoms
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Joined: 26 Aug 2012
Posts: 76



Post Reply with quote
UPDATE ON BUTYRATE:
I ran a 16mm flat wood bit through the 15.9mm ID butyrate a few times, and now it'll slide over the 15.9mm OD smoothly. I've been having some plunger head troubles with my homemade, so the airtightness of it is to be announced. The walls are still thick enough -in theory (with perfect tolerances), you're only shaving 0.1mm off. In practice, it's something between 0.25mm and 0.5mm.

Seriously, this stuff is awesome. No sticky melting issues, cuts cleanly, and doesn't discolor.
Sun Oct 07, 2012 5:09 pm View user's profile Send private message
Argoms
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Joined: 26 Aug 2012
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Post Been a while, hope double post is fine. Reply with quote
Just a clarification on something:
15.9mm butyrate has a 12.7mm inner diameter. This is a good barrel material for stock streamlines.
19.1mm butyrate has a 15.9mm inner diameter. This is a barrel material has a very loose fit on stock streamlines, and would be better for air guns/ high diameter springers.

You can fit 15.9mm butyrate into 19.1mm butyrate tube with some effort. The seal created is likely airtight. If you use a 16mm hole cutting bit, you can slightly increase the diameter of the 19.1mm tube to create a sliding fit.
Mon Oct 22, 2012 5:16 pm View user's profile Send private message
Argoms
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Joined: 26 Aug 2012
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Post Reply with quote
Another update:

Obviously, running a drill bit to widen the tube will allow air to pass through, along with giving a sliding fit. I could use perfect fit barrel materials up to 20cm without major issues, but with a longer barrel or tighter dart fit, this loose breech will not work. You'd need to have an O-ring or something to seal the breech, or air would escape around the dart.

It may be the cold weather having some effect, but I was recently able to get nested butyrate to slide when lubricated. It was just as hard as priming a k26 though.

Leaving a seam of butyrate un-drilled could let you slide with less friction while still getting an airtight seal. Or, you know, use an O-ring/washer. Much more reliable.
Wed Nov 28, 2012 9:40 pm View user's profile Send private message
ScoutsIX-3
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Post Reply with quote
Be careful when using a power drill to widen any kind of small plastic pipe. The pipes have a nasty habit of heating up and becoming deformed or tearing themselves right out of your hands when it becomes easier for the drill bit to catch and hold the side of the softened plastic than actual shave any plastic off. I'd recommend gloves, at least on the hand holding the pipe. I had a few close calls before I did the intelligent things and took some precautions. I'd also suggest considering doing this outside, as the fumes generated are rather unhealthsome. This method does work though; I'm not disagreeing with that.

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Tue Dec 04, 2012 2:50 pm View user's profile Send private message Visit poster's website
Argoms
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Post Reply with quote
It may be the fact that it's winter, but the butyrate's never even softened on me while I widened it.

I did, however, take off a bit of skin when drilling a hole through it without looking at my left hand.
Tue Dec 04, 2012 3:34 pm View user's profile Send private message
dog green 1
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Post Reply with quote
Just a quick question regarding barrel materials. Do those listed above differ in shell thickness to Nerf barrels?  I know from the barrel extensions I've put in the Recons I've had to modify them internally as the actual wall thickness of the conduit is thicker than the original.
The boys want me to do some work on their Rapid fires but want to avoid changing them internally so I can put the original barrels back in if needs be.
Fri Jan 31, 2014 9:09 pm View user's profile Send private message
SSGT
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They're a tighter fit on the darts if that's what you mean.

Also, if you mean a Rapidstrike, you don't want to use these barrel sizes. These barrels are for spring/air powered blasters not flywheels (a barrel won't do much good with a flywheel system, ideally you want to remove the barrel altogether) and even then only when the barrel has an airtight seal between it and the plunger (for example a Raider with a stock breech wouldn't benefit from one of these barrels).

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Sat Feb 01, 2014 3:13 am View user's profile Send private message
dog green 1
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Sorry for the delayed response. It's not the inner diameter I'm concerned with. The 20mm conduit from B&Q is fine for making extended barrels. Cheap and strong. However the wall of the pipe is thicker than the original barrel which means when fitting in things like a recon front end you have to some major sanding out to the inside of the foregrip to allow the barel to sit properly and the two sides to be screwed together again.
I was hoping some of those mentioned on the links might just slide straight in without any work needed. That would give you the option of changing the barrels.
Any clearer???
Fri Feb 14, 2014 9:48 pm View user's profile Send private message
SSGT
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Ah OK.  You might be able to find pipe made of the materials mentioned above with near stock OD (the stock faux barrel has an OD of about 19mm) but I can't say for sure (it's mostly hoses that have a 19mm OD). None of the sizes listed above are suitable for what you need, but EMA models do have 19.1mm butyrate or ABS pipe which might be worth a look.

As for actual wall thickness, it varies quite a bit with material (and manufacturer). It'll probably just be a case of finding pipe with a 19mm OD and checking the ID to make sure it isn't too tight. It's worth noting that some pipes quote the ID as the main measurement and others quote the OD. Wall thickness isn't even mentioned sometimes although it's often easy to work it out.

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Sat Feb 15, 2014 12:30 am View user's profile Send private message
dog green 1
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Thanks for that.  Looks like it's going to be a case of playing around to see what's best.
Sat Feb 15, 2014 10:11 am View user's profile Send private message
SSGT
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Actually, their 19.1mm butyrate and ABS both seem pretty damn close to stock dimensions (minus the ribs) for ID and OD (within about 0.1mm).

You pay bit more for the butyrate (it's cheaper but also shorter than the ABS) but it does come in nicer colours. Very Happy

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Sat Feb 15, 2014 12:18 pm View user's profile Send private message
UK Foam
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I'm a little confused. Do you know of two materials that will nest over one another that could be used for an xbz blaster?
Thanks Pete

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UKNerfWar
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EDIT

please don't necro old topics. If you have a question please start a new topic in the Q&A forum. It keeps discussion fresh and puts new, relevant information near the top of the forum.





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