The Mossberg 590S Magpul is a 12 Gauge pump-action shotgun set up for security and defensive use, with an 18.5″ barrel and factory-mounted Holosun HS407K micro red dot. It combines Magpul SGA adjustable stock ergonomics and a MOE forend with standard Mossberg pump-action features for straightforward field and range use. The design supports interchangeably cycling 1.75″, 2.75″ and 3″ shotshells for flexible loading choices.

Key Specifications

• The shotgun is chambered in 12 Gauge for common defensive and range ammunition availability.
• The action is a pump-action system featuring dual extractors and twin action bars for reliable cycling.
• The barrel measures 18.5 inches, providing a compact profile suitable for security and close-range work.
• The chamber accepts up to a 3-inch shotshell and the gun is documented to cycle 1.75″, 2.75″ or 3″ shells interchangeably.
• The stock assembly is a Magpul SGA adjustable stock paired with a MOE forend in gray for ergonomic adjustability and modularity.
• An Holosun HS407K micro red dot sight is installed at the factory for quick target acquisition with both eyes open.
• The reported unloaded weight is approximately 6.75 pounds, balancing carryability and controllability.
• The overall length is listed as 38 inches with an adjustable length of pull to suit different shooters.
• The finish is described as matte blued metal with gray synthetic Magpul furniture.
• Sights are a fixed bead with an optic preinstalled on a receiver reported as provisioned for optics.

Where original product information references magazine or tube capacities, note that some listings include higher-capacity descriptions. State laws may limit magazine or tube capacity; jurisdictions that commonly restrict capacity to 10 rounds include: Hawaii, California, Connecticut, District of Columbia, Illinois, Maryland, Massachusetts, New Jersey, New York, Rhode Island, Vermont, Washington, and Colorado. Verify local law before purchase or transport.

The 590S Magpul with Holosun HS407K is a versatile, short-barrel pump shotgun option for users needing a compact security-oriented platform with modern furniture and an optic-ready configuration. Its short-shell compatibility and adjustable stock make it suitable for range use, home-security setups, and other lawful defensive applications where a reliable, configurable pump shotgun is desired.