Blued, Winchester SX2, SX3, SX4, Browning Gold and Browning Silver 9 Shot (+4) magazine extension kit. These extensions are great for law enforcement officers, competition shooters and home protection. These kits are constructed of solid blued steel and come with spring, base clamp & follower. 7 Shot Model fits 18″ barrel or longer. 8 Shot Model fits 20″ barrel or longer. 9 Shot Model fits 24″ barrel or longer. 10 Shot Model fits 26″ barrel or longer. Will not fit SX1 shotguns.