Most of the parts on your Carbine are a mix of updated and replacement parts from other manufacturers. The rear sight, barrel band and safety are all updated parts. You do have an Inland stock, Inland barrel (obviously) and what looks like and Inland front sight (I think I see a "SI" mark). The hammer is a post-war replacement. The trigger housing is IBM.
You will get varying opinions about refinishing the stock, but I think the rack number on the stock is pretty cool and indicative of its use. I wouldn't refinish it. Then again, I like old military guns to look old and like they were used.
How does it shoot?