There are no known LB snipers in the 72L block (not even experimental).
The engraving for the serial number on the spring bar is an obvious fake.
the base mount is (in my opinion) 95% probably fake.
that makes the rifle fake.
the butt is wrong for a production or trials LB.
I am interested in seeing more of the rings - it is possible that they may be the only real part of this enshamble.