I have an airsoft Glock 19 that uses CO2 cartridges. It "cycles" looks, feels, and balances just like a regular Glock 19. Trigger isn't quite the same, but I have a Ghost 3.5 connector in my G19. I'll try to find who made it. There aren't any markings on the airsoft version at all, but I think it cost me around $80.
Edit: it looks like I have an airsoft Glock 19 made by KSC.