Pro Mag Industries Drum Magazine for HK VP9 Features This ProMag drum magazine is purpose built for the HK VP9 pistol chambered in 9mm Luger giving shooters a 50 round capacity well beyond a standard factory magazine. The drum body is molded from a proprietary DuPont Zytel based polymer chosen for its toughness and resistance to cracking under the stress of repeated loading. A blue steel upper magazine tower reinforces the critical feed lips area where a magazine typically sees the most wear. This combination of a durable polymer body and a steel feed tower is built to stand up to extended range use without failures. Inside the drum an injection molded magazine follower rides on a magazine spring formed from heat treated stainless steel a pairing designed to deliver smooth reliable feeding across all 50 rounds. Heat treating the spring helps it resist taking a set even when the magazine is stored loaded for long periods which matters for anyone keeping a VP9 staged for defensive use. Made entirely in the USA this magazine gives VP9 shooters a dependable way to extend their round count between reloads. It is a practical choice for range training competition style shooting or any application where extra capacity is an advantage. Pro Mag Industries Drum Magazine for HK VP9 Specifications Manufacturer: Pro Mag Industries Compatible Hosts: HK VP9 Caliber: 9mm Luger Capacity: 50 Rounds Material: Zytel Polymer Color: Black Magazine Tower: Blue Steel Spring: Heat Treated Stainless Steel Country of Origin: USA Available At: GrabAGun