PMC 556K: The X-Tac round from PMC ammo is a 5.56mm M855 cartridge with a LAP Green Tipped bullet that weighs 62 grains. This is a high-performance penetrator round. Hard-hitting and exceptionally accurate this is the same round that PMC produces for the South Korean Military. This ammunition is packaged with 20 rounds in a commercial box and 50 boxes in a 1000 round case. We sell this SKU by the 20 round box with a price break at the 50 box ( 1000 Round Case ) quantity.