Need help deciding which 30-06 barrel profile to get

[BoilerUP]

I thought the M40A5 used a 1:12 twist...?

[LoneWolf]

I thought the M40A5 used a 1:12 twist...?

You're right 1:12, I thought they had switched it over when they decided to go from a 25" barrel to a 20" for the adoption of a suppressor as a standard kit. The Army uses a 1:11.25. All of them put lead on target though.