The HK VP9 and P30 9mm +2 Conversion Kit is compatible with VP9 and P30 15 round factory magazines and installs in seconds.The design permits quick conversion of the factory magazine from 15 to 17 rounds. The conversion kit has been found to work very reliably with the HK factory magazine spring and body.XTech Tacticals MTX line of extenders are simply unmatched for reliability, ease of installation, and durability. Specifications for XTech Tactical HK VP9 & P30 9mm 15 to 17 Round Conversion Kit: Manufacturer: XTech Tactical Color: Black Gun Make: Heckler & Koch Gun Model: Heckler & Koch VP9, Heckler & Koch P30 Caliber: 9mm Luger Number of Rounds: 2 Features of XTech Tactical HK VP9 & P30 9mm 15 to 17 Round Conversion Kit Converts HK VP9 & P30 15-round magazine to 17-rounds Simple installation for quick upgrades. Improved recoil control and grip. Durable, high-quality materials. Adds grip length to magazine. Uses factory springs and bodies. Package Contents: XTech Tactical HK VP9 & P30 9mm 15 to 17 Round Conversion Kit What firearm models does the manufacturer say XTech Tactical HK VP9 & P30 9mm 15 to 17 Round Conversion Kit is compatible with? The manufacturer says that XTech Tactical HK VP9 & P30 9mm 15 to 17 Round Conversion Kit is compatible with Heckler & Koch P30, Heckler & Koch VP9