Mossberg 590S | 12 Gauge | 18.5in | MFG# 51605

The Mossberg 590S is a 12 gauge pump-action shotgun built around reliable, time-tested pump features and modern optic-ready convenience. Its 18.5-inch barrel and fixed synthetic field stock make it compact for transport while retaining full 3″ chamber capability. Receiver cuts accept low-profile micro red-dot footprints for simple optic mounting; a cover plate is included for standard carry. Typical applications include range training and professional security roles where robust cycling and accessory compatibility matter.

Product Specifications

• The brand is Mossberg.
• The model is listed as 590S.
• The manufacturer’s part number is 51605.
• The gauge is specified as 12 Gauge.
• The action type is Pump-Action.
• The barrel length is 18.5 inches.
• The chamber size is 3″, and the design cycles 1.75″, 2.75″ or 3″ shells interchangeably.
• The receiver is described as optic-ready with a cover plate when no sight is mounted.
• The stock is a fixed field-style black synthetic with a recoil pad.
• The commonly listed weight is 6.75 lbs.
• The overall length is listed as 39.5 inches in some sources.
• The sighting arrangement is a front bead with the receiver cut allowing optics.
• The choke is described as cylinder bore / fixed cylinder.
• The magazine is a fixed magazine tube.
• The UPC is 015813516051.

This 590S combines Mossberg’s traditional pump-action features—dual extractors, twin action bars and steel-to-steel lockup—with contemporary updates like an optic-ready receiver and short-shell cycling flexibility. The compact 18.5-inch barrel and synthetic stock provide a balance of handling and durability for users who value straightforward, dependable equipment. Whether for regular range practice or professional duty use, the 590S is configured to accept a micro red-dot, manage mixed shell lengths without adapters, and offer the familiar ergonomics of a Mossberg pump shotgun.

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