5.56 55gr FMJ
Personal Defense Ammunition
200-round case, 20 or 50 count box
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5.56x45mm in Starline brass with the 55 grain full metal jacket (FMJ) projectile. It is one of the most commonly used rounds for the AR-15 platform. The 55 grain projectile (.224 diameter) is the ideal weight for a wide range of barrel twist rates to include the 1-in-7, 1-in-9, and 1-in-8.
