What is lighter a bull contour a heavy contour or a super bull contour. What is the most versatile Twist rate for 5.56. As I am thinking of buying a ATRS AR and i am thinking of getting it custom built by them and i am making sure I get it right in all categories just so you know i am going to try to make a Mk12 Mod 0. I would really apreciatie it if you guys helped me out 
Thank you
-Ty
Thank you -Ty
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