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Gun Policy News


26 May 2008

Associated Press

The M855 round used in the M4 and M16 rifles is also referred to as 5.56 mm. That metric measurement is the diameter of the inside of the rifle barrel. The larger M80 fired by the M14 is a 7.62 mm round. Both types are manufactured at Lake City Army Ammunition Plant near Kansas City, Mo., and by General Dynamics in St. Petersburg, Fla. An M855 round has multiple parts. The bullet, or projectile, is made by first inserting a carbon steel penetrator into a copper... (

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