Carlson's Choke Tubes 04500 Magazine Extension 12 Gauge Remington 870 Remington 11-87 Remington 1100 Remington Versa Max Remington V3 8 Blued SteelCarlson's Shotgun Magazine Extensions add firepower to your favorite shotgun. These magazine extensions are constructed of blued solid steel and come with spring, base clamp and a high visibility follower. The threaded tube replaces you magazine cap and gives you the ability to add extra rounds to you magazine. Fits Remington 870 1100 11 87 Versa Max V3.