The Glock 17 Airsoft CO2 powered handgun is fully licensed by UMAREX. It has all the features of the firearm, but in a 6mm airsoft version. It uses standard 12 gram CO2 cartridges that insert into the magazine that holds 23 rounds, has a fully adjustable airsoft ho-pup system and fits most if not all standard GLOCK 17 holsters, accessories and gear.