Mossberg | 12GA 18.5″ Barrel | 4+1 | 85163

The Mossberg semi-automatic shotgun in this listing is configured with an 18.5″ barrel and an optic-ready receiver that accepts low-profile micro red-dot footprints for improved sight alignment. It features a clean-running gas-vent system, a quick-empty magazine release, an adjustable length of pull, and a fiber-optic front sight. The firearm is presented for security-oriented use and is built to accommodate adjustments for shooter fit and optics integration.

Typical applications for this configuration include security operations and tactical training where optic compatibility and adjustable ergonomics are valuable. The Accu-Choke system provides flexible shot control for different loads and roles.

Product Specifications

• The manufacturer is Mossberg.
• The manufacturer part number is 85163.
• The UPC is 015813851635.
• The gauge is 12 Gauge.
• The action type is Semi-Auto.
• The chamber size is listed as 3.
• The stated usage is Security.
• The barrel length is 18.5.
• The barrel finish is listed as Matte Blue.
• The shotgun uses the Accu-Choke System and ships with a cylinder bore choke installed.
• The listed capacity is 4+1.
• The overall length is 37.5.
• The length of pull is 12.5-14.25 and the LOP type is adjustable.
• The sights are a front fiber-optic and the receiver is optic-ready.
• The stock is synthetic (black) with adjustable LOP, cast and drop, and the firearm weighs 7.5.

This Mossberg configuration balances shooter-adjustable ergonomics, optic compatibility, and a user-serviceable choke system for flexible performance in security and training roles. The optic-ready receiver and adjustable length of pull allow the shotgun to be set up to individual fit and preferred sighting methods, while the Accu-Choke system provides options for patterning with different loads.

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