According to the seller- hiddensprings2020 in the 10 years he's been restoring (Humping) stocks this is the 1st Non Potbelly SA M1 Carbine stock he has ever seen. A Type IV with long barrel channel and M2 cut.
It would be a 1st for me also...... $350.00 Plus Shipping.... Beware :ugh:
M1 Carbine Stock and handguard Springfield Armory RARE! Non Potbelly | eBay
https://www.milsurps.com/images/impo...7/sl1600-2.jpg