TacStar/Lyman Plus 5 Magazine Extension for Mossberg 590

This magazine extension adds five rounds over the standard factory magazine capacity and is designed for use with compatible pump-action shotguns. The extension is machined from 6061 aluminum and finished in matte black anodize for a durable, low-glare surface. Its modular, reversible design allows the recess for a magazine/barrel clamp to be relocated for installation flexibility and practical use at the range or in field applications.

Key Specifications

• Compatibility: Mossberg 590, Remington 870, Winchester SXP.
• Capacity increase: +5 rounds over the standard factory magazine capacity (using 2 3/4" shells).
• Material: 6061 aluminum.
• Finish: Matte black anodized.
• Included components: Long magazine spring and high visibility follower.
• Recess: Recess cut for magazine/barrel clamp (clamp not included).
• Design feature: Modular reversible threading to change recess location.
• Model designation: Plus 5 (1082239 referenced).
• Weight listed as: .65.

This extension is a practical option for users who need increased magazine capacity with a lightweight, serviceable component. Its straightforward design and included hardware support reliable function and easy adjustment, making it suitable for regular range use and applications where added capacity and modular fitment are required.