ProMag H&K MP5/PTR9 9mm 40 Rounds Pistol Magazine Black. The high-tensile chrome silicon wire spring and injection-molded DuPont Zytel polymer follower ensure smooth jam-free operation. Backed by ProMag's legendary lifetime warranty for superior quality and lasting field service you can depend on. 40-round capacity. Specifications for ProMag H&K MP5/PTR9 9mm 40 Rounds Pistol Magazine: Manufacturer: ProMag Color: Black Fabric/Material: Polymer Magazine Capacity: 40 Round Caliber: 9mm Luger Gun Make: Heckler & Koch Gun Model: Heckler & Koch MP5 Condition: New Package Contents: ProMag H&K MP5/PTR9 9mm 40 Rounds Pistol Magazine What firearm models does the manufacturer say ProMag H&K MP5/PTR9 9mm 40 Rounds Pistol Magazine is compatible with? The manufacturer says that ProMag H&K MP5/PTR9 9mm 40 Rounds Pistol Magazine is compatible with Heckler & Koch MP5ProMag HECA17: H&K MP5/PTR9 9mm 40 Rounds Pistol Magazine Black