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11/18/2015 4:13:14 PM EDT
i have my heart set on a 12.5" upper from BCM..I have had one before in 16" SS410 and it shot beautifully..I will be shooting probably IMI 77gr otm exclusively and im wondering which upper if any would be more accurate?..or if the difference would be so small as not noticeable?

ss410  12.5"

1/7 twist
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