AR questions

Renegade

SuperOwner
Mar 5, 2008
9,502
113
Texas
Probably goes back to the AR being designed with 20" barrel with 1:12 twist to optimize the 55gr bullet.

It was originally a 1:14 but was not fast enough and was changed to 1:12 which seemed to work.
 

Mike_from_Texas

Active Member
Feb 10, 2010
988
63
North Texas
Bert the 1:7 barrels are going to favor the heavier bullets 69-77 grains typically. My 1:7 barrels shoot ok with 55 grain Bullet’s but shoot really well with 75-77 grains.


Sent from my iPhone using Tapatalk Pro
 

Dingo

Member
TGT Supporter
May 27, 2021
120
43
North Texas

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benenglish

Just Another Boomer
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Lifetime Member
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Nov 22, 2011
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Spring
Yeah, the link from Sam Colt is OK, especially with those stability factor charts. Renegade's link is better but lacks those easy-reference charts. Both have some obvious errors due to oversimplification but it's nothing that impacts someone who just wants to build a functional firearm.

Either will keep you out of trouble. If you ever want to learn more, you can find several books that can help you.
 

Dingo

Member
TGT Supporter
May 27, 2021
120
43
North Texas
Bert the 1:7 barrels are going to favor the heavier bullets 69-77 grains typically. My 1:7 barrels shoot ok with 55 grain Bullet’s but shoot really well with 75-77 grains.


Sent from my iPhone using Tapatalk Pro
Thanks, I have several 5.56, and they range from 1in7, 1in8 to 1in9. I’m thinking I would like to standardize to 1 twist rate for all.
 

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