Based on internet serial records (take it for what it's worth), your serial number puts it at a 1941 production year. Where did you find it? I would love to have it.
Is it chambered in .30 carbine? The discolored look reminds me of one I saw a few years back in 5.7 spitfire. It was in a commercial stock though.
https://www.johnsonautomatics.com/spitfa1.jpg
I use G96 gun treatment for everything. It removes rust and carbon, lubricates, and protects. Smells nice too!
https://www.mcssl.com/store/c0e84d9548e54592a9555a19c32338/gun-treatment-and-gun-oil/gun-treatment
Local gun shop just got a bm59 with a paratrooper stock. I've never seen one with a paratrooper stock and can't find much about it online. I know what the James River BM59s are going for and they are asking quite a bit more. (sticker price $2,200) It comes with 5 magazines and a multi tool.
Pinetree Pawn in Thomasville has the RPR and Savage Stealth in 6.5 CM. Since it's less than an hour drive from Valdosta, I ride over there from time to time and check them out. Good food in Thomasville too.