Mossberg 590, One Shot Magazine Extension increases your fire power by one shell with our shotgun magazine extension kits. These extensions are great for law enforcement officers and competition shooters in reducing the time to reload. They are also a must for home protection. + ONE Shot magazine Extension fits flush on 18.5" barrel.

These kits are constructed of solid parkerized steel and come with spring, base clamp & follower.

Kit includes : 1 Magazine Extension, 1Spring, 1 Base Clamp, & 1 High Visibility Shell Follower.