last week I purchased my second Mosin Nagant 91/30 -

I'm having trouble identifying the markings on the barrel and receiver and wondered if I could once again tap into the knowledge banks of the forum.

Some pictures to show you of the complete rifle - then the markings



Barrel:



Magazine:



Reciever:



Bolt:



Butt Plate:



I'm particularly interested in the 'A 1946 USSR' markings and their meaning.

Than ks in advance guys