2Crakd talks about what is said to be the next generation CO2 magazines for airsoft use, the Maxtact GMC-17 CO2 Magazine For TM/VFC Glocks. The MAXTACT GMG-17 32 Rounds Extended Co2 Magazine is a lightweight and durable aluminum magazine, weighing only 219.4g and measuring 170mm in height. Its "just right" extended length adds 5 rounds to your pistol's capacity without compromising handling.