Polymer magazines are designed for compatibility with Howa 1500, Weatherby Vanguard, Mossberg 1500 and Interarms 1500 rifles when utilized with Howa detachable magazine floorplates. These magazines feature a robust construction that guarantees extended durability. The increased capacity facilitates and simplifies the reloading process. Your shooting sessions with the Legacy Howa ammo boost magazine, designed to increase your range time by providing additional rounds per session The firearm is equipped with a 5-rounds capacity, allowing seamless cycling of .300 Win Mag shots, ensuring reliable performance and efficient operation