G&G Armament have shared details of their new CO2 lightweight 50 round magazine which will be available soon:
50 Round Light Weight Magazine
Reduce your combat load with the new G&G CO2 Lightweight 50 Round Magazine for GLK GBB pistols. We’ve redesigned the magazine to be constructed out of hard anodized aluminum alloy and reduced the weight of our previous version green gas extended magazines by 46%. And yes, the magazine is TM G-Series compatible for use with your current or upcoming builds. Coming soon to your local G&G dealer!
G&G Armament