Full metal jacket (ammunition)
Type of ammunition consisting of a soft metal core surrounded by a jacket of harder metal / From Wikipedia, the free encyclopedia
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For the 1987 film, see Full Metal Jacket (movie).
A full metal jacket (FMJ) bullet is a small-arms projectile consisting of a soft core (often lead) encased in an outer shell ("jacket") of harder metal, such as gilding metal, cupronickel, or, less commonly, a steel alloy. A bullet jacket usually allows higher muzzle velocities than bare lead without depositing significant amounts of metal in the bore. It also prevents damage to bores from hard steel or armor-piercing core materials.