Obviously the gun has been heavily buffed and replated and could be nothing more than a shooter.
However, what several earlier commentators have said and maybe haven't emphasized enough, is the lack of a serial number on the bottom of the butt or anywhere else on the actual frame of the gun.
This lack makes the gun contraband and subjects it to confiscation and the "owner" subject to arrest and prosecution. The serials on the other various parts don't count, only the one on the frame is what matters, and it has been removed. I wouldn't have this gun in my possession under any circumstance.

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Dean
SWCA #680 SWHF #446