if used with the guns original hop-up chamber and bucking

Built-In Hop Up Tool

Made in Germany from top-grade materials

Contiguous Milspec 1913 Top Rail and Milspec 1913 rail sections at the front of the rail

that's a non-issue for Walther PPQ GBB owners

Umarex High-Grade 12G CO2 Cartridges (50-Pack) Hi-Capa Magazine Valve if used with the gunsDescription: 12g CO2 Cylinders (50 Pack) Clean CO2 Doesn't dirty your air gun valves. 12 pack Number of rounds per capsule depends on the airgun. Manufactured under tight tolerances. SPECS CO2 quality is critically important for the health of your air gun. Without clean, reliable Umarex CO2 power, air guns can break down. Valves clog. O rings and seals deteriorate. While manufacturers meet standards of size and weight, they arent held to exacting