Magazine for Umarex GLOCK G18C GBB Full-Auto Airsoft Pistol holds 50 6mm airsoft BBs. (Airsoft pistol NOT included, Green Gas NOT included). Replace your shots quickly with the Umarex Glock G18C Gen3 GBB 6mm BB Airsoft Pistol Extended Magazine. Each magazine holds 50 rounds. With a capacity of 50 rounds, these Airsoft Pistol magazines help you spend more time firing and less time changing. Keep a spare magazine on hand for your shooting and training with the Umarex GLOCK G18C GBB Full-Auto Airsoft Pistol.