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Photo Credit: C. Todd Lopez
Jim Newill explains the effectiveness of the Army's 5.56mm M855A1 Enhanced Performance Round fired from an M4 Carbine against a 3/8 inch mild steel plate, and compares its performance against that of a 7.62mm M80 round fired from an M14, during a test fire event at Aberdeen Proving Ground, May 4, 2011. The M80 round, unlike the M855A1 round, was unable to penetrate the plate at 300 meters.