Any "crowns" or other marks on the metal bits?? From the inletting and the straight hand grip, no notch for bolt handle, I am thinking small ring - possibly Swedish? Needs a receiver ring to hold the rear of the top hand guard, like a swede does. There would be "crowns" on the springs, butt plate, floor plate area. Looks to be missing the "collar" that would go over the very front of the forearm.
Edit - I don't think that side bolt front band is from a Swede, so I am probably incorrect on my guess...