Kill Zone

When Calliegh states that the sniper was likely Marine Corps trained and they were among the best in the world, it is not an exaggeration. USMC trained snipers routinely win or place in the top five of many of the most difficult and rigorous sniper competitions in the world.

During the part where Calleigh is testing the ballistics of the bullets, the rounds are shown and labeled "28 GRAIN", "21 GRAIN", "14 GRAIN", and "7 GRAIN". Those bullet weights in the .223 Remington caliber do not exist. Those are too light. Real .223 Remington bullets weigh no less than 40 grains.