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Old March 3, 2009, 07:38 PM   #8
Senior Member
Join Date: February 2, 2005
Posts: 160
The only real "no-no" as far as 5.56 goes is never put anything over 55g though a 1:12 twist.......a lot of people are building "retro" ARs using surplus A1 uppers. The heaver bullets won't stabilize in the slower twist rate and accuracy beyond 100 yards really sucks.
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