7 Shot Remington 870, 1100 and 11-87 12 Gauge Mag Extension.
The ATI magazine extension Increases the capacity of your shotgun to 7 Rounds. Made of virtually indestructible DuPont Extreme Temperature Glass Reinforced Polymer injection molding over a steel connecting nut, the ATI mag extension will not rust or dent. The minimum barrel length for the 7 Shot extension is 18.5". Includes a new spring. Easy Installation, simply replaces your magazine cap nut.
Specifications and features:
7 round mag extension (adds 2 shells in magazine)
Fits Remington 12 gauge 870 shotguns
18-1/5" minimum barrel length
Glass filled nylon
Rustproof and dentproof
No gunsmithing required