This thing used a German gun as a base. The concept is not far away from the advanced laser pistol in the movie "Star War".
Looks to me the upper receiver's base was an Early 1930, barrel was cut away and replace with this longer one. See that bolt stop position, that's 1930 style. Why would someone install such a ugly long pipe was unclear... probably need a 16"+ barrel to attach that funny stock and avoid ATF registration.
The hammer and lock frame style point to earlier gun. Probably a Bolo, or Wartime, highly polished with sand paper. Probably used some Chinese replacement small parts.
The frame definitely came from a small ring, but it's hard to estimate the variation. The grip was cut away and replaced with this wired stock.
The Chinese characters on it basically says it's cut away in Nationalist era. Hehe
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