GLOCK 2255202 AIRGUN, 17 GEN4 BLOWBACK, BB GUN ACTIONUMAREX AIRGUNS GLOCK 17 GEN4 BLOWBACK BB GUN ACTION PISTOL The original GLOCK 17 pulled duty as a service pistol for the British army and countless police agencies throughout the world. This GLOCK 17 Gen4 CO2 blowback replica features the same enhanced grip texture that its firearm counterpart does. This replica features a drop out CO2 in mag design that adds to the realistic feel and function. The G17 Gen4 CO2 blowback also features a metal slide,