I've seen "Pawn Stars" a couple times and liked it because they mention the history of some of the items. The episode I remember they had some early $ printed by Ben Franklin at the time when the Sec. of Treas. was a signer of both the Declaration of Independence and the Constitution.
KPR, About the Saiga, I did not see the show so I don't know what they did to it, (I assume they cut down the barrel )
but in a previous thread Badgersmilk mentioned that AK's and SKS are "overgassed".
So they probably did not need to mess with the port.