Family, Friends won't let me look at the photos since I'm not a member. Will offer these thoughts though. The mainland Chinese made copies of a lot of firearms both before, during and after WW2. Most of them were copies of the Mauser handguns. I've seen photos of a broomhandle and a Mauser 1910 handgun. They were extremely crude but were stamped with english alphabet letters trying to duplicate original markings. Funny, they got the letters mixed up and spelled Mauser both 'Mouser", "Wouser" and "Wauser".
I took a look and it's my guess it's a "home workshop" gun. If you look at some of the guns turned out in Pakistan you can see some of the wildest designs and conversions. It's interesting the gun came out of The China, Burma, India Theatre.
i have seen one before but i can't remember the name of it. it's a chi-com copy of a russian pistol i think and i know this ain't spelled right but here goes it's a bospherien i think it's (boss-fer-een) is the way it is pronounced. more than likely i'm wrong, like i said i think (that may be my problem thinking).