Jim, Back in 1983, I use to buy Winchester Hi-Wall rifle parts such as the breech block and firing pins from Ben Rice of Cherry Hill NJ 08003 (he has since died) He made the Winchester breech blocks from 4140 steel with either a small or large dia firing pin hole. On his old list of parts were Kragicon handguards and he even made ram rod bayonet handguards with the two rivets.

I am certain Rick Bicon. would be a good choice Bob