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Old December 17, 2012, 06:12 PM   #13
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Join Date: June 18, 2009
Location: NorthWest USA
Posts: 1,996
1:7, 1:8 and 1:9 will work with most 5.56/.223 ammo the average person will use. I would read carefully what kraigwy wrote before choosing a twist rate.

For most of us who won't be going much under 55gr ammo, the 1:7 twist makes a lot of sense. I have three ARs with 1:7 and one in 1:9 and really can't see much difference with 52gr ammo (I haven't tried anything lighter). There definitely can be a disadvantage with heavier ammo and 1:9.
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