Nope. Neither of those either. Shotguns are kinda a niche airsoft market. Not really game worthy against Automatic Electrics. And they don't function like a true shotgun. Some do fire multiple shots but they they stay pretty much inline.
Sure you can make w/e, but that be an expensive "full auto" shotty once you take into account how expensive ($60.00 per) 27mm moscarts are and pretty limited in availability. An airsoft version would unless an electric motor was used to advance the chambers. It would be simply bullpupping the CAW Revolver Launcher using 27mm tubes instead of 40mm.
It probably be smarter to use the Tanaka M870 gas shells ($38 for 5). Unlike moscarts, they can use green gas and are realtively cheap. Airsoft Surgeon (Clarence Lai) made 3 upgraded replacement shells for the Tanaka series too. An 8 shot, slugshot, and magnums.