Mossberg 590A1 M-LOK 12 Gauge 20″ Pump Action Shotgun

About this product

The Mossberg 590A1 M-LOK is a service-oriented pump-action 12 gauge shotgun configured with a 20-inch heavy-walled barrel and XS Ghost Ring sights. It pairs a fixed black synthetic stock with onboard shell storage and an M-LOK-compatible forend for mounting accessories. The receiver and barrel carry a parkerized finish and the platform is designed to meet rugged durability expectations for defensive and duty-style applications. Controls are straightforward and built for dependable manual operation across environments.

Key Specifications

• Action type is Pump Action for proven, manual operation.
• Caliber/Gauge is 12 Gauge.
• Barrel length measures 20 inches.
• Maximum chamber size is 3 inches.
• Barrel finish is Black Parkerized.
• Sights are XS Ghost Ring for rapid sight acquisition.
• The stock is a fixed black synthetic design with a built-in 4-shell holder.
• The forend features an M-LOK compatible handguard for accessories.
• Choke type is Cylinder Bore.
• Safety is an Ambidextrous Top Tang design.

Designed for users who prioritize straightforward reliability and accessory flexibility, the 590A1 M-LOK blends service-grade features with practical ergonomics. Its rugged components and simple manual operation make it suited to defensive or professional roles where durability and maintainability are important, while the M-LOK handguard and fixed stock storage add practical utility for real-world use.

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