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 blued steel and come with 1 Magazine Extension and a barrel clamp for mounting a sling and adding support. DOES NOT COME WITH NEW SPRING, YOU USE THE ORIGINAL FACTORY SPRING!