SLOOOOW Twist AR barrles?

Anyone know if a company currently producing ( not interested in old stock ) some very slow twist are barrels in .223 or 5.56 on a non custom deal? As in they have them ready for purchase ? And when I say slow I mean 1:12 at the least 1:14 preferred .
Thanks

The AR retro guns used them. If you want a heavier contour you will need to custom order.

https://www.brownells.com/gun-parts/...?sku=100020999

In the past Krieger made me 13 twists. https://kriegerbarrels.com/twist#ar15

You might talk to Shilen. I've used a few of their 1:14 blanks to good effect making AR barrels, maybe they would build you a full drop in one.

Original was 1:12 then they over spun it so you got tumbling when it hit something. I.e., more damage on the perp.

Rock River produces a 1 in 12 twist ,as I have one, shoots the Saeco 225 70 gr rn real well
My barrel is a 24" heavy stainless, don't know if they have a shorter/ lighter version
this is 2 10 round groups at 100 Yards

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Originally Posted by Wolfdog91

Anyone know if a company currently producing ( not interested in old stock ) some very slow twist are barrels in .223 or 5.56 on a non custom deal? As in they have them ready for purchase ? And when I say slow I mean 1:12 at the least 1:14 preferred .
Thanks

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Green Mountain has 1:12 in stock at the moment.

http://www.gmriflebarrel.com/GMRBItem.aspx?Item=GM-M15

And they have a 1:14 twist for $195

http://www.gmriflebarrel.com/GMRBIte...1-6723e893d5ea

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Originally Posted by popper

Original was 1:12 then they over spun it so you got tumbling when it hit something. I.e., more damage on the perp.

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Ummm.... NO.

Understabilization caused the yaw effect.

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Originally Posted by popper

Original was 1:12 then they over spun it so you got tumbling when it hit something. I.e., more damage on the perp.

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The originals were 1/14 specifically to have marginal stability with the M193 55 grain ball. Winter testing revealed that a 14 twist was to slow for winter use. They went with a 12 twist until the M855 62 grain steel core NATO loading required a change to the faster 7 twist to stabilize them. The problem was the 7 twist over spun them so they DID NOT normally tumble thus reducing effectiveness of the system.

http://retroblackrifle.com/index.html

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Originally Posted by M-Tecs

The originals were 1/14 specifically to have marginal stability with the M193 55 grain ball. Winter testing revealed that a 14 twist was to slow for winter use. They went with a 12 twist until the M855 62 grain steel core NATO loading required a change to the faster 7 twist to stabilize them. The problem was the 7 twist over spun them so they DID NOT normally tumble thus reducing effectiveness of the system.

http://retroblackrifle.com/index.html

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Correct, the original twist was 1/14. One small correction; the M855 62 gr bullet will stabilize just fine in 10" or faster twists. The 7" twist was needed to stabilize the much longer tracer bullet which needed a "burn" out to 600 - 800 meters. The ammunition an appropriate barrel twist was originally developed to meet specifications for the SAW [M249] then the barrel twist of the M16A2 and subsequent variations were given the same barrel twists. Interesting to note, back in the early/mid '90s, the Marines ordered from Colt quite a few M16A2s with 9" twist barrels because they gave better accuracy, especially at 500 yards, with the M855 ammunition.

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Originally Posted by Larry Gibson

Correct, the original twist was 1/14. One small correction; the M855 62 gr bullet will stabilize just fine in 10" or faster twists. The 7" twist was needed to stabilize the much longer tracer bullet which needed a "burn" out to 600 - 800 meters. The ammunition an appropriate barrel twist was originally developed to meet specifications for the SAW [M249] then the barrel twist of the M16A2 and subsequent variations were given the same barrel twists. Interesting to note, back in the early/mid '90s, the Marines ordered from Colt quite a few M16A2s with 9" twist barrels because they gave better accuracy, especially at 500 yards, with the M855 ammunition.

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Thanks for the additional info. I've always read that the overly fast twist was solely to provide better penetration for the M855. Stabilizing the longer tracer rounds makes more sense.

I watched Green Mountain Barrel's site for a long time at those 14 and 12 twist barrels, and they were always out of stock. Gave up. So I bought another lower, upper parts, and turned down a retired 6mm 12 twist BR barrel, and have a 6x45 reamer in the mail to me. This should be a lot more funner! And I have gads of misc. 6mm bullets for let fly.