Walther CP99 Compact-CO2 Powered.177 Caliber BB Blowback (slide kick) action 18 shot removable (drop out) magazine Replica magazine release lever Powered by CO2, 12g cylinder Ergonomic grip with finger grooves Blowback, semi-automatic BB action 18-shot drop-free BB magazine CO2 compartment in the grip Fixed front and rear sights Compacted version of the CP99