Not a GBB, but I got an HFC series 80 1911 - its NBB, has the gas in the gun not in the mag, but its cheap (so are mags at $8 each). It has no adjustable hop, so range is limited, but for pistol games/pistol ranges it works great with .2g bb's. Its around $40 for the pistol, and while you 'get what you pay for' I've not had a single failure with the pistol since I've had it, its cheap and reliable, just not realistic. Just my humble suggestion - oh, you can get them at airsoftshogun.com, only place I've found them WITH mags. Gun works great on propane or green gas.