Mossberg 590A1 | 12 Gauge | 18.5″ | P/N 50799

The Mossberg 590A1 is a service-grade pump-action 12 gauge built to meet MIL-SPEC 3443G standards, featuring a heavy-walled, 18.5″ threaded barrel and Accu-Choke system with a cylinder choke installed. The design includes a drilled-and-tapped receiver (optic-ready with Shield RMSc footprint), an M-LOK compatible forend for accessory mounting, and a fixed black synthetic stock. Its construction emphasizes durability and serviceability for use in demanding operational environments.

Common applications for this model include law enforcement/tactical training and professional range or qualification work. Its rugged build and optic-ready receiver also make it suitable for organizations that require a reliable manual-action shotgun for routine operational use.

Product Specifications

• The manufacturer is Mossberg.
• The model designation is 590A1.
• The caliber/gauge is 12 Gauge.
• The action type is Pump Action.
• The barrel description is Heavy Walled.
• The barrel length is 18.50″.
• The chamber size is 3″.
• The capacity is 6 + 1.
• The choke type is Accu-Choke and a Cylinder choke is installed.
• The forend is M-LOK compatible for accessory mounting.
• The receiver is Drilled & Tapped and is optic-ready.
• The sights are a Bead Front and the receiver accepts a small reflex footprint cover plate.
• The stock finish/group is Black synthetic with spacer capability.
• The overall length is 37.75″.
• The weight is 7 lbs.
• The UPC is 015813507998.

This Mossberg 590A1 is engineered for operators who prioritize proven durability and straightforward function. Its heavy-walled threaded barrel, Accu-Choke system, and M-LOK forend provide a practical platform for duty and training use while the drilled-and-tapped receiver gives flexibility for low-profile optics. The 6+1 capacity and rugged synthetic furniture keep the design simple and serviceable for routine operational requirements.

Users commonly praise the 590A1 for its durable, MIL-SPEC construction and reliable manual action; many also appreciate the optic-ready receiver that broadens sighting options.

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