GLOCK G18C GEN 3 GBB 6MM BLACK AIRSOFT PISTOL | OFFICIALLY LICENSED BY GLOCKOVERVIEW The GLOCK G18C is the legendary full auto version of the classic G17 design. While you may never see the firearm version, Umarex has the only officially licensed airsoft replica of this rare design. The G18C fires in both semi and full auto configurations and uses drop free magazines that house both the 6mm BBs and the green gas. The GLOCK G18C uses Gen 3 styling features and will launch a stream of . 20 gram BBs at 300 FPS. Officially