Pro Mag Industries Magazine for MP5/PTR9 Features The Pro Mag Industries Magazine for Heckler and Koch MP5/PTR9 is engineered around a high-tensile chrome silicon wire spring paired with an injection-molded DuPont Zytel polymer follower. This combination keeps feeding smooth and consistent from a full 40-round load down to the last round reducing the chance of a jam interrupting a string of fire. The reinforced feed lips hold their shape under repeated loading and unloading which matters most to shooters who run mags hard in training or competition. Because it is built specifically to the MP5 and PTR9 geometry it drops in and locks up without the fitment issues that come with generic magazines. The DuPont Zytel polymer body is naturally corrosion resistant so the magazine holds up in humid ranges wet field conditions and long-term storage without rusting or seizing. That same polymer construction keeps the magazine lightweight which adds up when a shooter is carrying several loaded spares on a belt or in a range bag. ProMag backs the magazine with its lifetime warranty giving buyers confidence in long-term field service and quality control. For MP5 and PTR9 owners who want dependable high-capacity magazines they can restock without worry this Pro Mag Industries magazine is a straightforward made-in-USA choice. Pro Mag Industries Magazine for MP5/PTR9 Specifications Manufacturer: Pro Mag Industries Model: Magazine for MP5/PTR9 Caliber: 9mm Capacity: 40 Rounds Compatible Hosts: Heckler and Koch MP5 PTR9 Material: Polymer Color: Black Available At: GrabAGun