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3/20/2017 5:03:23 PM
Posted: 8/15/2011 6:22:34 AM EDT
[Last Edit: 8/15/2011 6:22:52 AM EDT by Rytle]
Does any body make a 20 inch A1 Profile barrel Chrome lined with 1:7 twist? I've seen Green Mountain's but I can't imagine why anybody would want a barrel with a 1:12 twist.

ETA: I did search, the only thing that turned up was 6 years old
Link Posted: 8/15/2011 6:35:15 AM EDT
[Last Edit: 8/15/2011 6:36:14 AM EDT by gotigers]
I was gonna say Green Mountain, but i agree. That twist is strange.

Edit: call them. They may turn one for you in 1:7. When i call them, they seem willing to help.
Link Posted: 8/15/2011 6:47:48 AM EDT
I sent them an E-mail a while back, they said they weren't doing custom barrels. I guess I'll try calling them though. May also see if I can get a spike's lightweight middy barrel.
Link Posted: 8/17/2011 11:56:12 AM EDT
Anybody else?
Link Posted: 8/20/2011 3:03:21 PM EDT
Green Mtn emailed me early July saying they would have A1 profile barrels in 1x7 or 1x8 sometime mid-August. They still aren't listed on their site, and I've contacted Dennis about in the last couple of days. I'll let you know what he says. I expect I should know by Monday or Tuesday.
Link Posted: 8/20/2011 4:21:02 PM EDT
Originally Posted By a390st:
Green Mtn emailed me early July saying they would have A1 profile barrels in 1x7 or 1x8 sometime mid-August. They still aren't listed on their site, and I've contacted Dennis about in the last couple of days. I'll let you know what he says. I expect I should know by Monday or Tuesday.


That will be a great addition.

The 1/12 barrels are not bad though. They work great with 55gr..

I'll be keeping my eye out.

Link Posted: 8/20/2011 7:06:45 PM EDT
Originally Posted By a390st:
Green Mtn emailed me early July saying they would have A1 profile barrels in 1x7 or 1x8 sometime mid-August. They still aren't listed on their site, and I've contacted Dennis about in the last couple of days. I'll let you know what he says. I expect I should know by Monday or Tuesday.


Damn, that'd be awesome, keep us posted
Link Posted: 8/20/2011 7:08:47 PM EDT
The 1/12 barrels are in response to the retro crowd who buys these barrels. Not sure why anyone thinks it's a strange twist, it's the correct twist for a A1 barrel and used by the military for years.

These kids with there new fangled twist rates.
Link Posted: 8/20/2011 8:01:04 PM EDT
Originally Posted By Garandboy:
The 1/12 barrels are in response to the retro crowd who buys these barrels. Not sure why anyone thinks it's a strange twist, it's the correct twist for a A1 barrel and used by the military for years.

These kids with there new fangled twist rates.


Well, obviously I know it wasn't a strange twist 50 years ago. You think I'm dumb?
Link Posted: 8/24/2011 3:33:37 PM EDT
So any word on those GreenMountain barrels?
Link Posted: 8/25/2011 6:27:05 PM EDT
Crickets...
Link Posted: 8/25/2011 8:04:03 PM EDT
Originally Posted By Rytle:
So any word on those GreenMountain barrels?


Can't help much, I have one in the parts box but haven't done anything with it yet.

To the OP, have you thought about asking in the retro section of ARFCOM. They are aware of most if not all of the A1 barrels on the market. Just don't call 1/12 strange, they go nuts.
Link Posted: 8/25/2011 8:25:45 PM EDT
Del-Ton were suppose to have 1/12 retro barrels too.

It's vaporware at this late date...


Link Posted: 8/27/2011 4:59:49 AM EDT
and yet more crickets
Link Posted: 8/27/2011 10:25:53 AM EDT
tag for more 20 in pencil profile chrome lined 1 in 7 crickets.
Link Posted: 8/27/2011 11:41:25 AM EDT
I'll have to call this week. I was extremely clear on what I was after, and they confirmed what I was asking for. It wouldn't surprise me if they weren't blowing smoke on the date or something. I can't believe they'd have any problems with the faster twist being that they make lots of barrels like that anyway.
Link Posted: 8/27/2011 12:08:18 PM EDT
Originally Posted By Garandboy:
The 1/12 barrels are in response to the retro crowd who buys these barrels. Not sure why anyone thinks it's a strange twist, it's the correct twist for a A1 barrel and used by the military for years.

These kids with there new fangled twist rates.


I was just about to respond with this info. The 1:12 twist is basically the twist used on a Vietnam Era A1 build. I seem to remember reading one time that the original twist on the earliest rifles was 1:14 and quickly changed to the 1:12 when they were first starting being issued during the Vietnam War. I don't remember what the reason was but I think it had something to do with tumbling in flight but I could be wrong. Can anyone confirm this?
Link Posted: 8/27/2011 12:20:38 PM EDT
Originally Posted By jdubya87:
tag for more 20 in pencil profile chrome lined 1 in 7 crickets.


Link Posted: 8/27/2011 12:22:33 PM EDT
The Green Mountain A-1 barrels are outstanding. I have sold over 20 and can't say that I saw one that didn't shoot sub moa groups. They shoot 55 gr bullets like a laser and at maximum velocity and that's what the majority of people fire in their AR-15's anyway. I shoot 50gr Hornady Vmax's in my personal one. The Green Mountain A-1 barrels pops them out at a higher velocity than any other AR I have ever tested, 3400 FPS and the terminal effect is absolutely devastating. Its the perfect walking varmint rig because of the light weight profile. My complete upper with a Clark carbon fiber handguard. weighs only 3.8 lbs and shoots 1/2"@100yds with boring regularity, its my favorite upper.
Link Posted: 8/27/2011 12:44:25 PM EDT
Originally Posted By riflecrank:
The Green Mountain A-1 barrels are outstanding. I have sold over 20 and can't say that I saw one that didn't shoot sub moa groups. They shoot 55 gr bullets like a laser and at maximum velocity and that's what the majority of people fire in their AR-15's anyway. I shoot 50gr Hornady Vmax's in my personal one. The Green Mountain A-1 barrels pops them out at a higher velocity than any other AR I have ever tested, 3400 FPS and the terminal effect is absolutely devastating. Its the perfect walking varmint rig because of the light weight profile. My complete upper with a Clark carbon fiber handguard. weighs only 3.8 lbs and shoots 1/2"@100yds with boring regularity, its my favorite upper.


If I could say that I would only ever shoot 55 gr I'd buy one of those in an instant, I just want to keep my options open for whatever I may need to use.
Link Posted: 8/27/2011 2:51:57 PM EDT
1:12 was the standard twist for over 25 years. But that was almost 25 years ago now.
Link Posted: 8/27/2011 4:48:04 PM EDT
Originally Posted By Circuits:
1:12 was the standard twist for over 25 years. But that was almost 25 years ago now.


I do believe we've established that.
Link Posted: 8/27/2011 8:11:14 PM EDT
Originally Posted By Circuits:
1:12 was the standard twist for over 25 years. But that was almost 25 years ago now.


Yes, but it will also shoot heavier bullets. I have shot 60 grain V-Max reloads from mine and 62 grain Wolf HP. The XM855 is longer and will not (in my experience) work well. Most bulk ammo and most of my reloads are 62 and below so I don't sweat it.

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