Green moutan barrel blank (7.62x39)

14423 Views 63 Replies 23 Participants Last post by 1biggun, Mar 26, 2013

mrtank

Discussion Starter · Jun 22, 2010

Well Green Mountain Is listing an "AK" barrel blank now. Just though I would let you you know. Gunsmith Edition 20" AK Barrel Blank

1 - 20 of 64 Posts

1biggun

· #2 · Jun 23, 2010

I just ordered one. I really wish it was not profiled. I rather be able to keep it heavy for a target build. wish they would also sell one unchambered.

I will stick it on a AMD 65 kit and see how it works. the price is right I see its cut rifleing.

Im sure for $30 it will be top quality LOL. I may rechamber it using my reamer see what I get first.

steve10

· #3 · Jun 23, 2010

I'm having a hard time understanding why they're so cheap.

chipmechanic

· #4 · Jun 23, 2010

steve10 said:
I'm having a hard time understanding why they're so cheap.

I have a hard time understanding why other barrels are so expensive. 5 minutes of CNC time if that on that barrel. Only $5 shipping too. I don't know why they are charging sales tax though.

steve10

· #5 · Jun 23, 2010

I guess I'll pull the trigger then. Worst comes to worst it's only 35 bucks.

I can't say I'm enthused that it's 20 inches, but beggars can't be choosers.

chipmechanic

· #6 · Jun 23, 2010

You'll have to machine the barrel anyway. Its not machined for size externally.

nkluksda

· #7 · Jun 23, 2010

chipmechanic said:
I have a hard time understanding why other barrels are so expensive. 5 minutes of CNC time if that on that barrel. Only $5 shipping too. I don't know why they are charging sales tax though.

I would guess that the major cost is the time and machinery overhead to do the accurate deep-hole boring, and then straightening of the barrel. Read these:

Barrel Making - The Art and Science
Lilja Precision Rifle Barrels - Articles: The Making of a Rifle Barrel

Plus, if you can find it, Harold Hoffman's books show in great detail the equipment and processes used for rifle barrel making. The equipment overhead is large, and if you have a DIY rifle boring / rifling setup, the time is not inconsequential. Profiling - that's easy. As you said, a few minutes in a CNC lathe. But that's after you have a barrel that's bored straight and accurately, rifled, and straightened and stress-relieved.

1biggun

· #8 · Jun 24, 2010

You'll have to machine the barrel anyway. Its not machined for size externally.

Its says AK profile so Im not sure what that is going to be. I hope it is over size. Ill post when I get it. mine was $36 shipped. Im a little unsuure why there so cheap as well. I want to build a target set up but with a 311 bore so i can also shoot surplus ammo with out the pressure increase. 20" is fine with me it will add about 150 or more FPS. I wonder how long they will have them?? I almost called them today.

sjohnson

· #9 · Jun 24, 2010

1biggun said:
I just ordered one. I really wish it was not profiled. I rather be able to keep it heavy for a target build. wish they would also sell one unchambered.

I will stick it on a AMD 65 kit and see how it works. the price is right I see its cut rifleing.

Im sure for $30 it will be top quality LOL. I may rechamber it using my reamer see what I get first.

Agree with everything except that it's cut rifling. Button rifling is listed by Green Mountain, and that is not cut rifling, but rather is a type of cold forming where metal is not removed, but rather displaced.

chipmechanic

· #10 · Jun 24, 2010

I bought one too. Wasnt planning on building another AK but this might change my plans. Never know what will come in the mail Still trying to figure out why they charged sales tax and what state its going to.

jreifsch80

· #11 · Jun 24, 2010

yesterday i talked to dennis from gmb and he said it's machine finished oversized. he said he'd try to get a picture and the measurements on the gm website within 24 hours he said their whole idea behind them was the home builder with lathe access pretty much so we can make our odd ball barrels easier (tabuk, long akm, etc)

ashhoe

· #12 · Jun 24, 2010

chipmechanic said:
I bought one too. Wasnt planning on building another AK but this might change my plans. Never know what will come in the mail Still trying to figure out why they charged sales tax and what state its going to.

They charged me the MI 6% tax. I suppose it's the "get as much as you can for these barrels Jenkins, or you're fired" kicker.
I wonder who will be the first one to chuck one of these up in a drill press and finish it with files and sandpaper, you know it's coming.

Coils

· #13 · Jun 24, 2010

"get as much as you can for these barrels Jenkins, or you're fired"

LOL

Yeah I took a chance too and ordered one.
Since I don't have a lathe, maybe I'll be the drill press guy?

chipmechanic

· #14 · Jun 24, 2010

I got an email from them today. The barrels are 1"x20" unchambered non profiled .310" rifled blanks. I have no idea why they advertise them as 7.62x39 when that is a chambering. They could advertise them as 7.62x25 or 7.62x54 or even 32 ACP for that matter.

ashhoe

· #15 · Jun 24, 2010

Mildly deceptive but it sound like a fun project still. I guess I'll need to get a X39 reamer now. I wonder if they'll have them for sale at GM in a day or so. They have pics up now also, that would made things a lot clearer from the begining. I was going to pick up a few of them but I think one will be enough for now.

TRX

· #16 · Jun 24, 2010

I just got off the phone with Dennis at GM. The first thing he mentioned was that, despite what the web site says, they're not chambered, and he apologized about it.

When I told him I'd heard about the sale on gunco, he asked if I would mind posting something about the chambering thing.

Most of GM's barrels give a typical cartridge, like ".40-65", and I've had to look up the cartridge specs to guess what the size of the barrel was, so it's consistent, if misleading.

Anyway, they're straight 1" rifled tubes, no taper, steps, tenon, or other machining. I bought two. He said they've sold a ton of them in the last couple of days.

He said the price should be good all summer, and that they were going to greatly expand their lineup of military-style barrels. The ones closest in the queue are various AR-15 barrels.

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MasterGuide69

· #17 · Jun 24, 2010

ashhoe said:
They charged me the MI 6% tax. I suppose it's the "get as much as you can for these barrels Jenkins, or you're fired" kicker.
I wonder who will be the first one to chuck one of these up in a drill press and finish it with files and sandpaper, you know it's coming.

Wow, I was going to get after it with my dremel, but that sounds like a much better idea!:thankyou:

1biggun

· #18 · Jun 24, 2010

The barrels are 1"x20" unchambered non profiled .310" rifled blanks. I have no idea why they advertise them as 7.62x39 when that is a chambering. They could advertise them as 7.62x25 or 7.62x54 or even 32 ACP for that matter.

Sweet. I have the reamer for the x39 an at 1" they would work on some bolt actions (not remington 700) like the mosin or ruger or win. I see a 1" bull barrel target build coming soon that will also shoot factory loads. Now I need some one to make cheap over sised gas blocks or a sagia shot gun clone. If there decent I may get a few and chamber them and sell them possably. a 1" bull barrel mosin would be cool.

there add is very missleading it says profiled and also 7.62x39 which it is not. I hope they come out with some 5.45 blanks also in the same price range Id jump all over that.

Coils

· #19 · Jun 25, 2010

Yep, got the email too.
I agree, they should have mentioned about the "no chamber" thing, but oh well I'll send it to 1biggun and let him do it.

I think it's a good deal yet and not bitch about it.

mrtank

Discussion Starter · #20 · Jun 25, 2010

Being a barrel blank It does open up some possibilities. I wish it was the longer blank that they use to make the rpk barrels, but I guess beggars can't be choosers.

I have a 1895 Chilean Mauser that that would be a nice conversion to 7.62x39.

Could do a heavier barrel psl carbine....

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