Lake City Ammunition 5.56x45mm NATO 62 Grain XM855 SS109 Penetrator Full Metal Jacket in MTM Box of 100 $57.99 Product Information Federal American Eagle Ammunition is loaded to NATO specifications, and even includes the green painted tip. This is the same ammunition currently being used by the US Military and is first run quality product. Headstamp will be marked with "LC" and the last two digits for the year of production. As an added value this ammuntion comes packaged in a reusable 100 round MTM Flip-Top Ammo Box Midway USA product number 120930. The MTM ammo boxes are the best way to keep ammunition free of dirt and moisture. This ammunition is non-corrosive in boxer-primed, reloadable brass cases. Please Note: While the 5.56x45mm NATO will fit in a .223 Remington chamber, the 5.56 is a military round that runs at higher pressures than its .223 counterpart and is not recommended to be fired in a .223 Remington chamber. Technical Information Caliber: 5.56x45mm NATO Bullet Weight: 62 Grains Bullet Style: XM855 Penetrator FMJ Case Type: Brass Ballistics Information: Muzzle Velocity: 3104 fps Muzzle Energy: 1326 ft. lbs.