Aluminium

>>33545843
the deal with breakline is the chamber isnt exact. the casing is what takes most of the force as it expands when fired and gets wrecked

>>33545904

That's what I figured. As long as I use a thin steel liner which fits the casing snug, I think it will be OK?

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>>33545843
I think you're underestimating how much aluminum is used in modern firearms.

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>>33545843
Winchester Model 59 semi-automatic. Aluminum receiver, fiberglass barrel with a steel insert.

>>33546017

No no, 4 of my 5 guns have aluminium receivers, I'm not worried about that I'm worried about its ability to hold structure as a barrel.

I can't machine a steel barrel in its entirety, so I just want to line an aluminium outer barrel with a thin steel inner barrel, because I can cast the aluminium around it and create whatever aesthetics I want.

If this works I want to try a rifle. Looking forward to carving a stock.

>>33546037

Aha this is the sorta shit I wanted to see.

Fibreglass is certainly stronger than aluminium, but then again a 12g sure generates more pressure than a .22

Thanks guys with just these posts I think I'm confident this will work

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>>33546067
>line an aluminium outer barrel with a thin steel inner barrel

Armalite did that in the 60s, so it's feasible. The Armalite AR-17 semi-automatic shotgun had an aluminum receiver and a steel barrel (aluminum shroud/outer barrel).

The Winchester 59 design might work better, as it had a floating chamber, which allowed for the steel liner and fiberglass barrel >>33546037

I'd stick to low-pressure rounds, however.

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castings another issue entirely but you can go pretty thin on a steel barrel

>>33546099

I'll be doing extensive testing, starting with subsonic .22 short and moving up. I'd be really pleased if it can handle .22LR and over the moon with .22 mag.

My other hangup was the fact I'm going to cast it and not mill it. From (vague) memories very few guns have had can't aluminium parts and they are not well rated by /k

>>33546127
If you're worried about cast aluminum strength, you can always just thicken the steel liner.

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>>33546067
check out slip on powerheads, most use aluminum as the barrel.

http://www.spearfishingplanet.com/member-items-spearfishing-marine-related-equipement/23254-red-anodized-powerheads-$13.html

sure they only last a dozen shots, and are meant to be used underwater, but it's viable. ish.

I appreciate this advice, when I'm done I'll be sure to post it so you guys can see

>>33546188

Oh I definitely want this to last more than a dozen shots. Think "forever"

>>33546207
a cold hammer forged barrel won't last forever, but what you're thinking about doing sounds viable
https://www.gunpartscorp.com/ad/881160.htm

>>33546127
22mag and 22lr are not the same thing
firing 22lr though a 22mag chamber is dangerous
not life threatening but you have issues like split cases and failures to extract
theres a reason revolvers that fire both 22lr and 22mag come with separate conversion cylinders

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>>33545843
>why isn't aluminium used more in firearm design
u hwat?

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>>33545843

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http://www.alloutdoor.com/2014/02/14/whistlepig-1022-barrel-review/

>>33545843
Get an actual .22 barrel liner. They're like $30. You're supposed to epoxy them into a barrel. They come prechambered.

>>33545843
>Would a cast aluminium .22 pistol be able to handle the pressure if it had a steel barrel liner?

what do you think happens when you put steel and aluminum next to each other for any length of time? hint: galvanic corrosion

>>33545843
Because aluminum is a shit metal.

t. former aluminum welder

>>33547024

That's fine I'll galvanize the steel with something before I cast the Al around it

>>33547499
you seem to be confused. zinc would only encourage the corrosion.

>>33547524

Why would I use zinc? I'll electroplate it with something, maybe chrome.

>>33546247

How will it function if I don't chamber it at all?

Like if I just got a 5.6mm diameter piece of steel tube and use the rim of that tube to hit the rimfire? If I don't bother to chamber the barrel I'll lose a bit of velocity and might get split cases, but then I could shoot any .22 from it.

I'm not concerned about accuracy, it only has a 4 inch barrel