Carlson 20ga Remington 870 100 11-87 8 Shot Mag. Ext. Add firepower to your favorite shotgun with the Carlson 20 Gauge Remington 870, 100, and 11-87 8 Shot Magazine Extender. These magazine extensions are constructed of blued solid steel and come with spring, base clamp with swivel stud, included, to work with quick detachable swivel, not included, and a high visibility follower. Some extensions require factory follower and will not come with one.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. Made in the USA Made from Chrome Moly Steel Expands shell capacity of the shotgun Matte black finish Add firepower to your favorite shotgun Great for home protection, competition shooting, and law enforcement Manufacturer: Carlson Choke Tubes Model: 04530 SKU: SI_1124616