b18/19 copies have been converted to gas ram, most recently Pyramyd was doing these with the Air Venturi rams right up to when the rams really started coming from the factory.Ya know, fwiw, if I were to enter the "Ram" realm, Id probably just wait till AGD had some more reman ram guns on special........they are cost effective also. Let someone else do that conversion work if you are looking to shoot. If you are looking to tinker, then yes, they have been done succesfully before.Good luck and God bless, Farmer