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Small diameter barrels

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Small diameter barrels

Unread postAuthor: john bunsenburner » Sat Dec 27, 2008 11:16 am

As most of you know I am building around on a hammer valve sniper "rifle". After running the specs through GGDT and being terrified I made a thread where many suggested to make the barrel^s ID alot smaller. I then gave up the idea of shooting snow and fixed on shooting pellets with a caliber of .175(4.5mm). Now GGDT predicts great results and I am very eager to finish the gun but on thought crossed my mind:

A copper tube as a barrel with an ID of 4.5mm cannot be very stable. It would be a shame if the barrel broke quickly and that will happen fairly quickly. My idea is to put the 4.5 ID tube into a tube of the same length with a larger ID( I have a spare with 15mm ID) and then to fill the resulting space between the two pipes with something to have a small caliber but a stable and strong barrel. Now I have two questions:

1. Would this work or is there a far better solution?

2.What would you recomend for me to use as a filler?

Any comments are appriciated, I wish you all happy holidays and happy new (spudgunning) year.
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Last edited by john bunsenburner on Sat Dec 27, 2008 11:48 am, edited 1 time in total.
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Unread postAuthor: ALIHISGREAT » Sat Dec 27, 2008 11:30 am

yes it would work... and you could use epoxy to fill the gap, epoxy putty could work.
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Unread postAuthor: john bunsenburner » Sat Dec 27, 2008 11:35 am

What about using molten metal to fill the gap( alli, tin, zinc or lead?) It sure is alot cheeper. Just out of curiosity: Has any one ever tried this before?
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Unread postAuthor: ALIHISGREAT » Sat Dec 27, 2008 11:39 am

i would stick to epoxy to be honest... much simpler and easier than molten metal.
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Unread postAuthor: john bunsenburner » Sat Dec 27, 2008 11:43 am

Do you know a place where i can order epoxy(or get it in NYC with in the next week). It is hard to get here in switzerland and if then it is very expensive (80$ for a liter...)?
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Unread postAuthor: jackssmirkingrevenge » Sat Dec 27, 2008 11:47 am

I wouldn't fill it all, rather make wooden spacers and use the external tube as an integral suppressor.
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Unread postAuthor: ALIHISGREAT » Sat Dec 27, 2008 11:49 am

john bunsenburner wrote:Do you know a place where i can order epoxy(or get it in NYC with in the next week). It is hard to get here in switzerland and if then it is very expensive (80$ for a liter...)?


just try any hardware store and ask for epoxy....
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Unread postAuthor: john bunsenburner » Sat Dec 27, 2008 11:50 am

SO how exactly would that work JSR? And thanks for the info Ali, do you think i can take it with me onto the plane ride back?
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Unread postAuthor: jackssmirkingrevenge » Sat Dec 27, 2008 12:02 pm

I transported epoxy in my suitcase no problem, but that was from Europe, US security officials might be a bit more overzealous.

As to an integral suppressor tube, have a look at this thread.
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Unread postAuthor: ALIHISGREAT » Sat Dec 27, 2008 12:11 pm

yay my thread :D i haven't used my PVC cannon/silencer in ages... i must whip it out when it gets warmer.
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Unread postAuthor: john bunsenburner » Sat Dec 27, 2008 12:21 pm

Ok thank you, i will have a loot at the thread in a second and i am going out into mid town now, mybe ill find what i need, what epoxy do you recomend?

Edit: I looked at the thread but i still do not quite under stand what exactly to do, care to elaborate?
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Unread postAuthor: ALIHISGREAT » Sat Dec 27, 2008 1:58 pm

i'll draw a diagram!

brown = spacers
gold = epoxy

the barrel has small vents in it to use the outer barrel as a silencer.
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Unread postAuthor: jackssmirkingrevenge » Sat Dec 27, 2008 2:09 pm

john bunsenburner wrote:I looked at the thread but i still do not quite under stand what exactly to do, care to elaborate?


Make sure the epoxy isn't as thick as you are, otherwise it'll never flow :roll: :wink:
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Unread postAuthor: ALIHISGREAT » Sat Dec 27, 2008 2:30 pm

jackssmirkingrevenge wrote:
john bunsenburner wrote:I looked at the thread but i still do not quite under stand what exactly to do, care to elaborate?


Make sure the epoxy isn't as thick as you are, otherwise it'll never flow :roll: :wink:


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Unread postAuthor: D_Hall » Sat Dec 27, 2008 3:08 pm

For such an application... Ditch epoxy and go with polyurethane. Uncured, it flows like water (if you get the right stuff).
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