I got a bunch of literature and parts from a retired gunsmith in the 70's and there were some parts lists and memos from Remington about the parts they had for the Parkers, they called it the model 860 or something like that though. They mentioned some of the parts were rough forgings and not machined yet so as to be able to hand fit. They also had a bunch of rough machined stocks for the various grades. The lists were dated in the early 50's and I don't know if this was before the DelGrego operation bought the rest of the parts or not.
I do know that Winchester sold a lot of their surplus barrels for the model 70 and some other rifle models and you could buy .300 savage barrels from Century or some other surplus dealer. Maybe some such thing happened with the shotgun parts.
