The Lyman 1082239 Plus 5 Magazine Extension Fits Mossberg 590 Black Aluminum is a modular shotgun magazine tube designed to add dependable capacity to your Mossberg 590. Machined from tough 6061 aluminum with a matte black finish, this extension delivers a smooth, consistent feed while keeping overall weight balanced at the front of the shotgun.

This extension provides an additional five rounds over the standard factory magazine when using 2 ¾ inch shells, making it well suited for range sessions, training, and competition where extra capacity and reliable cycling matter. The included long magazine spring, high visibility follower, and reversible tube design allow you to fine tune function and clamp placement to match your setup. It reflects Lyman’s focus on practical design and durable construction for dedicated shotgun shooters.

• Manufacturer: Lyman
• Model: Plus 5
• Capacity: +5 rounds over standard factory magazine (2 ¾ inch shells)
• Compatibility: Mossberg 590; also listed for Remington 870 and Winchester SXP
• Material: 6061 aluminum
• Finish: Matte black
• Includes: High visibility follower and long magazine spring