ASG's CZ 75D Spare Magazine holds up to 15 rounds and is powered solely by CO2. It's a great option for field play since a single magazine can go by very quick. It has an integrated screw mechanism to tighten the CO2 cartridge without the use of tools. All in all, the spare CZ 75D magazine is a must-have for all 75D owners.
Perfect spare magazine for my CZ 75D Compact at a really EXCELLENT price. The only thing that might be worth commenting on is that the little screw head under the magazine for screwing in the CO2 might be a little difficult to locate sometimes. For this reason I might suggest using a wider flat head screwdriver instead of the default one that comes with the sidearm. All in all, great purchase.