The way I see it I have never come across a Co2 mag capable of lasting as well as a well put together gg mag. Although I've never come across the aps gg glock mags I've had to fix a few WE ones for people and they where no bother. Some for friends which I know are still running. the early variant WE glock co2 mags where terribly designed and failed quickly, not had experience with current or the aps. I would also agree the kwc co2 guns and mags are not great having worked on them. One thing I do know I've played gbb pistols only quite heavily for the past 17 years I went from tm sig, to tm & kjw capas (kjw co2 mags also crap, gg ones good). Tm Detonics and more recently the hk45 and uspc. A lot of my mags where 2nd hand from the off, I used then sold on and I still know are working today because they are with people I know. Most of them I never serviced the odd one of my capa and detonics mags got a slow leak but where easily remedied. As far as metul goes I can live without it for a good cold running gbbp that runs on reliable gg mags. I used to build a fmk version and have an abs build for colder times in the past but I don't bother now.
