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 Tactical's MTX line of extenders are simply unmatched for reliability, ease of installation, and durability! Note: WILL NOT SHIP TO CA, Cook County IL, CO MD, MA, NJ, NY, DC, CT, HI, VT, WA or INTERNATIONAL.