I ran across this target rifle in a pawn shop. It is a .22. I apologize for the crap photos, I will go back with a better camera when I am back in town.
So on the modified stock, the forward grip has been widened with extra wood, there is an interesting stamp pressed into the wood. The pressed stamp is circular and reads, SAdNSDAP, and has the SA logo in the center. The stock has a metal butt plate and the hole for locking the rifle in the into the rack. Again sorry for the poor photos but they should allow you to get an idea of it visually.
So what is this stock and could it be a period piece?