"Bought the E.F. 1911 Tac with a spare magazine. So far, they have both performed flawlessly. These magazines are full metal with a good weight and feel. After each CO2 cartridge, it is a good idea to add some oil to the release valve, which will prevent the O-ring housed inside from cracking; CO2 is rather cold when pressurized, which damages the rubber O-ring. Take good care of it and it will continue to last and perform well!"