This extension allows you to increase the ammunition capacity of the shotgun to 8 rounds. The extension is made of tough 6061 aluminum. This allows the tube to have a large wall thickness to improve rigidity without compromising overall weight. The tube locks down on the end of the magazine. A long threaded external ring locks dwon the fore-end and a shorter external ring locks down the fore-end lock. The extension is supplied with a follower and recoil spring.

 

Total length measures 13 1/2 inches