Lake City MX855 5.56mm/.223 Remington 62 Grain Full Metal Jacket Boattail Steel Core 420 Rounds On Stripper Clips In Ammo Can. NATO specs. Steel core; crimped and sealed primers. Light armor piercing. For use in 1:9 twist rate barrels or tighter. Comes on stripper clips and includes stripper clip guide. Comes in 420 round sealable ammo can.