I'm going to guess that gun is not import marked?
This looks like a possible pre-Sino Soviet configuration. The "28" number on the receiver is likely under the wood line, and there will be a corresponding 28 fitment mark on the barrel shank.
Though there is no way to prove it, this one might have come back from SE Asia in the 1960's or 70's. You don't see the unscrubbed 'Serial Number Only' guns from importers. But with the bubba'd stock, missing parts and no papers, it's not a highly valuable piece.
This would make the paratrooper spike bayonet pretty irrelevant.
This looks like a possible pre-Sino Soviet configuration. The "28" number on the receiver is likely under the wood line, and there will be a corresponding 28 fitment mark on the barrel shank.
Though there is no way to prove it, this one might have come back from SE Asia in the 1960's or 70's. You don't see the unscrubbed 'Serial Number Only' guns from importers. But with the bubba'd stock, missing parts and no papers, it's not a highly valuable piece.
This would make the paratrooper spike bayonet pretty irrelevant.