8 shot magazine extension for the Weatherby PA-459 20ga pump shotgun. Will not fit the Semi Auto shotguns. Fits guns with barrels of 18 1/2 inches or longer. Will add 2 rounds of 2 3/4 shells to your shotgun. These kits are constructed of solid steel and come with 1 Magazine Extension and a barrel clamp for support (sling swivel loop pictured is no longer included). DOES NOT COME WITH NEW SPRING, YOU USE THE ORIGINAL FACTORY SPRING!