Very interesting. Pics are a little fuzzy. Would be interested in seeing a better macro photo of the muzzle and crown. Looks almost like it was hacked off, and then later installed a 91/30 style front sight. Crown and muzzle doesn't look rounded enough to emulate what we'd see on a 91/38 for example. Don't see any Czech marks on the top receiver flat, so I think it's safe to rule out 91/38. It also looks like US proofs on the barrel shank. In addition, the barrel shank has not been shortened, so it has not been rechambered for .30-06 anyways and most likely still retains it's original caliber chamber 7.62x54R. Rear sight is interesting. Looks like a Finn M27 style rear sight with the small notched piece of metal that is held in place by 2 screws. The stock is also interesting. Looks like an M38 stock, but maybe some measurements of the stock may help us determine exactly what it came from. As well as the rifle and barrel. Perhaps someone tried to cut it to match an M38? Have never seen any known production models, but guessing as it never left, someone tried to make it like a carbine.