Neal Weaponry Steel Flash Can/Muzzle Flash/Blast Can. It is made of High Quality Black Oxide steel. Length of Flash Can: 2.50 inches. A large portion of the flash can is knurled which gives it an eye catching look. The size is 1/2x28 for 5.56 NATO/.223 Rem or Wylde/.224 Valkyrie/.300 Blackout/.22 Nosler/ calibers or similiar weapons. This flash can is designed to direct gases and noise forward away from the shooter and enhance the weapon's appearance. It is not designed to reduce recoil or muzzle rise.