Although based on the Model 500, and mechanically the same, the 590 has stronger parts, an optional vented heat shield (protecting from barrel heat), sling swivels, a bayonet lug (for the M7 bayonet), ghost ring sights, and an extended 9-round capacity magazine. The Mossberg 590 is an extremely rugged and reliable weapon that passed the rigorous military testing involving 3000 rounds fired without a failure. Both 2 3/4 and 3 inch shells can be mixed in the magazine.

The 20 inch barrel M590 weighs 7 pounds (empty). The 590 has a parkerized finish and durable synthetic stock and forearm. An ambidextrious safety is conveniently located on top of the receiver.

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