PPSH serial number.

Went and bought my self a world war 2 soviet PPSH (Is real as all the markings fit up) But was wondering if there was anyway I could use the serial numbers on the gun to find out where it was made and if it saw any action… the main serial number on the body of the gun is “НБ9731” can someone say if this means anything or can tell me a place to find out?

Here is a link to PPSH website http://www.ppsh41.com/markings1.htm.

I have seen ads in shotgun news for new production semi auto PPSH rifles that sound interesting.

As far as being able to tell if yours saw any action, I would have to say it almost next to impossible know without documentation coming with the rifle.