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Barrel for 4mm or 5mm steel balls

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Barrel for 4mm or 5mm steel balls

Unread postAuthor: Steverulez » Mon Mar 20, 2017 5:42 am

Hey guys. I was wondering how do I get a barrel measuring 4.1mm or 5.1mm inner dia. For steel bbs. I can find any tube which would suffice my needs. From where can I get it or who can make it or how can I make it myself ?
It's really important for it to be of precise size as I'm building a full auto bb gun involving solenoid valve and arduino . Since only a little amount of air will be passed at once, It should be efficiently used.
Thnx
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Re: Barrel for 4mm or 5mm steel balls

Unread postAuthor: Mike__ » Wed Mar 22, 2017 9:04 am

Hi Steve,
I purchase K s brass tubing from my local hobby shop (Australia)
http://www.ksmetals.com/26.html
I use both 5mm and 6mm tubes to use 4mm and 5mm ball bearings. With a wall thickness of 0.45mm the internal diameter is 4.11mm and 5.1mm. I use 12" lengths and sleeve them in the next sizes up for added stiffness. They do make longer lengths.

noticed last week that their 1/4" (6.35mm) stainless steel tube is 22gauge wall thickness which if my calculations are correct should be 5.07mm internal which would help accuracy. Plus being stainless steel there should be less wear. $9aus from my lhs, so will be buying this for my next qev build when some parts arrive

Hope this helps

Mike
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Re: Barrel for 4mm or 5mm steel balls

Unread postAuthor: farcticox1 » Wed Mar 22, 2017 6:02 pm

I would use McMaster Carr here

https://www.mcmaster.com/#seamless-tubing/=16vcmch

but depends on your location I guess
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Re: Barrel for 4mm or 5mm steel balls

Unread postAuthor: Mike__ » Fri Mar 31, 2017 6:01 am

K and s brass tubing 3/16 external diameter (4.762mm) wall thickness 0.356mm = ID 4.05mm. Comes in 12" and 36"

Mike
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