WTB M1 30 carbine S.G. stock

I’m looking for a S.G. “In box” marked stock

Have a read of this first. 'Markings' info starts about half way down. Most importantly, stocks weren't always marked.
http://www.uscarbinecal30.com/stocks.html

I have one with SG on the buttstock and a 46 in a circle in the slingwell

Jeff this really belongs in the buy and sell column. An S.G. stock with a stamp of RSG and a number is normal. Made by Robert Irwin for not only S.G. but also for S'G'. So they made stocks for both plants of Saginaw Gear. S'G' stocks will not have a number. Now you need to know which type stock you need. All three types had the S.G. with a crossed cannon stamped in a box.