This is Aguila .223 Remington 55-grain FMJ ammo.

Hit your target and train hard with Aguila .223 Remington target and hunting ammo. This popular varmint hunting and target-shooting round deliver exceptional accuracy at an affordable price. A 55-grain projectile quickly takes out medium-sized game. Featuring premium brass casing and primers manufactured, it includes clean-burn powders for consistent and reliable performance. Double down on firepower and try out some Aguila .223 ammo.