It's a strange piece to me.
The pocket for the trigger assy. is cut in at an angle, forward, instead of straight down. The barrel channel also has a peaked ridge running from the mag well to the front swivel stud, tapering from back to front. Also, the pocket for the lug is cut as wide as the inside of the stock. The opening at the bolt same as a l/a. A lot of stocks laying around here, nothing looks like it.
I'll put it on the: Unkown" pile. Might be foreign job.
