Check the listing for details. Carlson's Remington 870/1100/11-87 12ga Magazine Tube Extension- 10 Shot. Color: Black, Condition: New. Listed at 84.95 USD. 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. Easy to follow instructions are included. The magazine extension tube is great for home protection, competition shooting, and law enforcement. Fits: Remington 870, 1100, 11-87, Versa Max, and V3 **Magazine round count is for the total capacity using 2 3/4-inch shells including 1 in the chamber, When using 3" shells you lose 1 shell capacity. When using 3 1/2" shells you lose 2 shell capacity.** **Remington extensions require removal of tabs / detent in magazine tube on newer model shotguns** Specifications: Model: 04504 Capacity - 10Length - 14.25"