Caliber: 5.56mmBullet Type: Full Metal Jacket Boat TailBullet Weight: 55 grMuzzle Energy: 1255 ft lbsMuzzle Velocity: 3250 fpsRounds Per Box: 20Boxes Per Case: 50Casing Material: BrassHazair: YesAmmunition cannot be shipped to a P.O. Box, please use a physical address during checkout. For restricted state buyers (CT, IL, NJ), please email a copy of your state's credentials, and a photo ID along your order number to [email protected] within 5 business days to avoid cancellation and refunding your order. For California, Massachusetts and New York buyers, please have your dealer email us a copy of their FFL or Ammo Vendor License along with your order number to [email protected] within 5 business days to avoid cancellation and refunding your order. Your order will not ship without us receiving this information. Thank you for your cooperation