590A1 series models are Mossberg’s top-of-the-line tactical shotguns with many in service with the Department of Defense and law enforcement departments across the nation. Designed to meet military requirements, the 590A1 seeks to be tougher than any other pump-action shotgun on the market and to provide unwavering reliability and durability under a variety of environmental conditions. It does this by incorporating all-metal construction, a heavy, thick-wall barrel, and a tough parkerized finish combined with Mossberg’s tried and true model 500 pump action design.