Mossberg 590S Magpul | 12 Gauge | 18.5in | 51606

The Mossberg 590S Magpul is a purpose-built 12 Gauge pump-action shotgun fitted with Magpul SGA furniture and a factory-installed Holosun HS407K micro dot. The model ships with an 18.5 inch barrel and is specified to cycle 1.75″, 2.75″ and 3″ shells. Standard Mossberg reliability features—dual extractors, twin action bars, and a top-mounted ambidextrous safety—are part of the package.

Product Specifications

• The manufacturer part number is 51606.
• The UPC is 015813516068.
• The model is 590S.
• The gauge is 12 Gauge.
• The action type is Pump Action.
• The barrel measures 18.5 inches.
• The chamber accepts up to 3‑inch shells.
• The barrel uses a cylinder bore (fixed) configuration.
• The stock is a Gray Magpul SGA adjustable synthetic with MOE forend.
• The metal finish is specified as matte/blued.
• The installed optic is a Holosun HS407K micro dot.
• The shotgun is specified as short-shell compatible (1.75″, 2.75″, 3″).
• The weight is listed as 6.75 lbs.
• The firearm includes swivel studs for sling attachment.

This Mossberg 590S Magpul combo pairs familiar pump-action function with modern furniture and a factory-mounted micro dot to simplify sighting. It is well suited to work-up and range training or for competition formats and drills where quick follow-up shots and modular ergonomics are priorities. The 18.5-inch barrel and short-shell compatibility give the platform flexibility across a range of loads while the Magpul SGA stock provides adjustable length of pull for different shooters.