Whelen, I don't know of anyone, but all it is, the right port for the gas, and the right powder, I"d check into any of the custom M1 builders that have a top name, and I"m not even sure who that is these days.. I"m sure Roland Beaver is no more in business???
Its not magical, its simply don't over or under gas it and make sure you don't run powders/loads that would bend the op rod, and IIRC, maybe can get it supported somewhat by mods?
