Mossberg 500 is a series of pump action shotguns manufactured by O.F. Mossberg & Sons. The 500 series comprises widely varying models of hammerless repeaters, all of which share the same basic receiver and action, but differ in bore size, barrel length, choke options, magazine capacity, stock and forearm materials.
Every Mossberg 500 shotgun starts out with an aluminum receiver. Because of this, Mossberg guns manage to remain lightweight while still being strong enough to handle rough duty. Mossberg shotguns are no strangers to being stuffed in a police cruiser or dragged through a swamp, and in recent years, they have proven themselves as very capable breaching tools and combat weapons in Iraq and Afghanistan.