Wade, you got off track a bit. Barts rifle is not a "Turk" and the shroud is as long as the entire barrel. You are correct about the Turk reciever though. I gave 49$ for mine.
You have a Model 88 Commision rifle The shroud was to take the place of wood hand guards. The S denotes that it was chambered and barreled for the new .323 spitzer bullet.
M88
You have a Model 88 commision rifle. They were made with a protective shroud instead of wood hand guards. The S denotes that is was chambered for the new .323 spitzer bullet.