Small-caliber projectiles, such as the M855 ball round, are some of the simplest munitions in theArmy inventory. The M855 projectile (1) depicted in figure 1 is comprised of three components:a lead-antimony slug, a steel core penetrator, and a copper jacket; and is similar to theammunition that has been used for the last century. The outer shape of the projectile generallycan be described by three regions, the leading end or ogive, a main body, typically a cylindricalsection, and the aft end which may include a chamfer, radius, or tapered section referred to as aboattail.This ammunition is used in service and training for the M16A2/A3/A4, the M4, and the M249weapons.
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