5.56 X 45mm 55gr Lead-Free Frangible Ammunition!! NEW Brass, 300

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Silver State Armory Ammo 5.56x45mm NATO 55 Grain Barnes RRLP Frangible

5.56 x 45mm NATO Factory Seconds! 55gr FMJBT, Reman Brass, Bulk Pack 450 rounds-FREE AMMO CAN!!! (Tan) - Green Country Ammo

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5.56×45mm NATO - Wikipedia

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Noobie guide to 5.56 AR rifle ammunition. – Matt's Homepage