Remington 870/1100/11-87 Magazine Extension, 9 Shot. These easily increase your firepower with these shotgun magazine extensions. Simply replace the factory mag cap with the threaded longer tube.  They are great for law enforcement officers and competition shooters. They are also a must for home protection. (9 shot extension fits flush with 24"  barrels but will work with longer barrels.) 

 All extensions will fit the 12, 16 and 20 gauge Remingtons. They include the extended mag tube, longer spring, hi-visibility orange shell follower, and a support bracket that attaches to the barrel and mag extension for added strength.  The bracket has a built-in dome stud that provides a convenient point for sling attachment. The swivel in the photo is not included, but from our experience, we like the Uncle Mikes QD Super Swivel.