Check the listing for details. Carlson's Remington 870 1100 1187 12 Gauge 8 Shot Magazine Tube Extension #04500. Color: Black, Condition: New. Listed at 73.53 USD. Carlson's Remington 870 1100 1187 12 Gauge 8 Shot Magazine Tube Extension #04500 Carlson's presents their solution to upgrading the capacity to you favorite shotgun. Made from blued solid steel, Carlson's Shotgun Magazine Extensions include everything you need to install: spring, base clamp, and a high visibility follower. Simply by replacing your magazine tube cap and spring, you can add rounds to your shotgun's capacity with ease. The Carlson's Shotgun Magazine Extension is an ideal accessory for home protection, self defense and competition shooting. Features and Specifications: Manufacturer Number: 04500Carlson's Remington 870/1100/11-87/Versa Max 12 Gauge 8 Shot Magazine Extension BlackCaliber: 12 GaugeCapacity: 8 Shot total capacity with 2-3/4" shellsBody Material: SteelSpring Material: Heat Treated Spring WireFollower Material: PolymerFollower Color: Orange8.25" overall lengthSpring, follower and clamp includedColor: Blued finishFits: Remington 870/100/11-87/Versa Max Note: Tabs inside magazine tube must be removed for installation.