A friend and I shooting my Sig Sauer 516 AR-15 style 5.56mm rifle with EoTech 512. We are using American Eagle 55gr FMJ XM-193. I know that 62gr is optimal for this barrel twist but it was cheap blasting ammo. Magazines are Magpul P-mags, Vertical grip is a LaRue Tactical also Light mount is a LaRue.
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