Metro Last Light Season Pass Question.

Hello. This is my First time Writing a thread So im sorry if i posted this in the Wrong Spot. To get to it I had a Question i was hoping Someone here maybe able to Answer, I Recently purchased the Metro LL Season Pass and was Wondering does anyone know where Exactly your Able to Buy the Abzats Shotgun besides in the Armory in the Very Beginning?

Wait... when was there ever a Season pass for Last Light?

Yeah it was really below Radar but it was Released Maybe 4 days ago.