Nonocat does a very quick video shooting with the Cybergun Colt Junior 25 Gas Blowback Pistol which is perhaps the cutest GBB pistol that is easily concealable. Made by WE Airsoft, this licensed Colt trademarks, a 12cm length, and a magazine capacity of 6 BBs. It's a good backup pistol as long as you remember where you put it in your webbing given how small it is.