C02 Half Blowback - extremely efficient due to the fact that there is less slide travel and it uses the left-over air from firing the bb to cycle the slide. The design is way less complicated than a full blowback design. Manufacturing costs are lower than a full blowback, which brings down the retail around 30-40%.FeaturesLightweight, rugged injection molded polymer frame w/ aluminum alloy slide; Fully licensed by GLOCK w/ complete rollmarks on the slide and logos molded to the frameTraditional GLOCK sightsFunctional GLOCK trigger safetyGLOCK Gen4 style frame with finger grooves removedSlip resistant grip texturing w/ front & backstrap checkeringAmbidextrous slide stopGLOCK accessory railRealistic gas blowback system to simulate slide cycle and recoil