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Author Topic: Has anyone here taken the barrel off an A-bolt?  (Read 413 times)

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Offline MZ5

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Has anyone here taken the barrel off an A-bolt?
« on: November 13, 2009, 04:38:31 PM »
How do the barrels come off, exactly?  I'm looking especially/mostly for people who have actually done it or been there watching.

How does the "Barrel Mounting Block" work?  What, exactly is it and what, exactly, does it do?  It looks from the exploded drawing in my owner's manual like it's the recoil lug.  However, it kinda also looks like it may serve as a barrel nut (like on a Savage or various machine guns).  Is it that?  Is it involved in setting headspace, or is headspace set through the step/ridge on the barrel like on a Remington, Ruger, or Winchester?

Anyone know for certain?
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Offline Nobade

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Re: Has anyone here taken the barrel off an A-bolt?
« Reply #1 on: November 14, 2009, 02:15:44 AM »
You don't want to do this. The barrel threads are jammed into the bottom of the receiver threads, and will normally gall terribly when the barrel is removed. Then you end up with it not out or in, and in a mess. I have had to remachine the action threads on the two I took apart, and never again.

The block you mention is the recoil lug, just like on a Rem 700. The barrel stops against it.
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Offline MZ5

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Re: Has anyone here taken the barrel off an A-bolt?
« Reply #2 on: November 14, 2009, 06:50:43 AM »
I was afraid it was just teasing me (re: the possibility that it's a barrel nut to set headspace like a Savage).

Thanks also for the info on galled threads.  My brother destroyed a Savage receiver because of galling just as you describe.  In fact, I'm not sure whether he ever got the barrel out.  We were trying to get the barrel off to switch out, but the threads destroyed themselves as the barrel un-screwed and we couldn't get it either back on nor off (just like you, it sounds).
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Offline gunnut69

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Re: Has anyone here taken the barrel off an A-bolt?
« Reply #3 on: November 14, 2009, 12:12:16 PM »
S&W did that to allow the dropping of the barrel pin.. Usually the Smiths can be rebarreled but a pin has to be added. Nobade have you tried a bit of heat perhaps to loosen the fit before unscrewing the barrel?? I guess its just a sign of our through away times. MZ5- the threads inside the receiver can be re-cut(to a larger diameter) and a new barrel threaded to fit. It can be fixed but as Nobade has alluded to, it may not be worth the time/money.
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Offline MZ5

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Re: Has anyone here taken the barrel off an A-bolt?
« Reply #4 on: November 14, 2009, 06:31:22 PM »
Yeah, it wouldn't even be close for me.  Frankly, every rifle out there besides the Marlins and Savages (barrel nut guns) are not worth re-barreling to me.  I'd have as much into a gunsmith as a new/different rifle from most (or all?) of the people whose guns I might buy would cost me.  I do appreciate the supplementary info, though.
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