Definitely an Arisaka, although it's been highly modified. Under the front scope base there should be at least one hole, possibly two. If it has one, it's a Type 99. If it has two, it's a Type 38. I guess it's also possible that they used that hole to mount the front base, somehow, assuming it's a T99. I'd have to do some more looking to get more details. Any chance of more pics?