Thread: Smith & Wesson M&P15 Sport II M-LOK .223/5.56 AR-15 Rifle 10305 30+1 16 Ammo
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Old 03-29-2021, 03:16 PM
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Your rifle has a 1:9 barrel twist, so don't expect great accuracy with anything over 55gr. Basically the faster the twist, say 1:7 in an AR, the better the accuracy with heavier bullets (62gr or heavier).
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