With the onset of the cold season, CO2 powered gas blowbacks are usually preferred. Mach Sakai takes a look at tone. The Carbon 8 Black Cz 75 2nd.ver GBB Airsoft gun is a CO2-powered airsoft pistol with a slim grip and a graceful appearance. It features a 102 mm inner barrel, variable hop-up, and a magazine capacity of 24 shots. The gun is made of ABS resin slide and frame with steel parts. It is known for its stable shooting, responsive blowback, and excellent design.