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Posted: 4/27/2014 5:15:43 PM EDT
Is 7068 strong enough to make a barrel out of?  Obviously it won't hold rifling, so you'd need a steel liner.  I was thinking a 4140 or 4150 liner that's .325 around the bore and .476 around the chamber, so basically .05" thick.  Also a steel sleeve in the gas port to reduce erosion.
Link Posted: 4/27/2014 6:55:51 PM EDT
[Last Edit: 4/27/2014 6:57:38 PM EDT by AeroE]
Link Posted: 4/28/2014 1:46:18 PM EDT
What is your goal?

Light weight with rigidity?  Heat dissipation?

Teludyne Industries has an interesting concept; they sleeve a lightweight steel barrel in an aluminum tube and fill it with a proprietary blend of epoxy and heat conducting materials, making a very lightweight, stiff, accurate barrel that rapidly dissipates heat.

Might be a simpler solution if that's what you are trying to accomplish.

Link to an article explaining it.

They do AR's

I have a nice piece of Aluminum 1" tubing and a spare 10/22 barrel on my bench, one of these days I intend to try to duplicate their system.......
Link Posted: 4/28/2014 5:04:21 PM EDT
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Originally Posted By AeroE:
Do you know if this piece of stock is heat treated?  
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Originally Posted By AeroE:
Do you know if this piece of stock is heat treated?  


T6511.

Originally Posted By AeroE:
Do you have a piece of material on hand already, or is this something you found by searching on line?


I don't have any on hand, I'm not going to invest in something without doing research first.

Originally Posted By AeroE:
Barrels get hot enough for the difference in the coefficient of thermal expansion for each piece is not negligible.  The aluminum will grow almost 50% greater than the steel liner.  If they are bonded together, then the bond line stress should be examined.


And this kills that idea entirely.  What about Titanium?  Specifically 6AL-4V.  I realize it would expensive, but would titanium's lower coefficient of thermal expansion be a problem?  Would the steel trying to expand further than the titanium cause the titanium to crack?


Originally Posted By PR361:
What is your goal?

Light weight with rigidity?  Heat dissipation?


Light weight

Originally Posted By PR361:
Teludyne Industries has an interesting concept; they sleeve a lightweight steel barrel in an aluminum tube and fill it with a proprietary blend of epoxy and heat conducting materials, making a very lightweight, stiff, accurate barrel that rapidly dissipates heat.

Might be a simpler solution if that's what you are trying to accomplish.

Link to an article explaining it.

They do AR's

I have a nice piece of Aluminum 1" tubing and a spare 10/22 barrel on my bench, one of these days I intend to try to duplicate their system.......


The Teludyne's are nice, but when ultimate lightweight is the goal, they just aren't quite there.
Link Posted: 4/28/2014 6:17:32 PM EDT
I wasn't recommending them so much as an examination of their process, which might be adapted to your needs. Something along the lines of machining a steel barrel to minimal safe dimensions and fitting it with a machined aluminum sleeve and filling the void with an epoxy mixture. a low-buck alternative to a carbon fiber wrapped barrel.

Link Posted: 4/28/2014 6:45:50 PM EDT
[Last Edit: 4/28/2014 6:50:00 PM EDT by AeroE]
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