Likely byf45 under mounts and is that a turret mount hiding in the picture?
44 D barrel code with byf 1
is it for a byf44 or for a Byf 45 ???
...barrel 44 D 821 with byf 1 and serial number on receiver 18052 no letter block...
I'm not an expert on snipers, but the sniper WaA under the serial is bad IMO.
I can't tell if that mark next to the receiver is an "l" or just a scratch. I'm going to say byf45.