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

5.56 55gr Frangible Lead-free primer-Non-toxic. Fully Processed and Lab Tested! Velocity of 2350 FPS.

SinterFire Reduced Hazard Ammo 223 Remington 55 Grain Frangible

200 Rounds of Discount 55gr MC .223 Ammo For Sale by Remington

Ammunition - Ammunition By Calibre - 223 Rem & 5.56 NATO - Page 1 - SFRC

223 5.56x45 Ammo 55gr FMJ Federal American Eagle (XM193X) 500 Round Case

SinterFire 5.56 NATO 55gr Ammunition - 250 Round Box - Clark Armory

5.56×45mm NATO - Wikipedia

Rifle Ammunition - FieldsUSA

What is the difference (if any) between the ammunition used by the US military and what civilians use? - Quora

Maxim Defense 5.56x45mm NATO Ammo 55gr Tumble Upon Impact (TUI) Solid Copper Spun Lead-Free 20/Box

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