Take your range training and shooting competitions to the next level with this Winchester® 5.56x45mm M855 Green Tip Full Metal Jacket 62-grain Rifle Ammunition. This .223 / 5.56 NATO Ammo is made with high-quality brass cartridge cases and is guaranteed to provide consistent precision with every shot. Stay on target and dominate the competition while using Winchester 5.56x45mm NATO FMJ 62 gr. Rifle Ammunition. M855 is often called “green tip” ammo. The tip of the projectile is marked green to denote a steel “penetrator” in the lead core. This type of ammo is often prohibited for use at indoor shooting ranges due to its ability to penetrate backstops, and damage baffling.