Go to the cheat room, it's under the overpass by Novac, just type in "Tcl" once you get to the door..
(I have a bug going on, where I can only open the door from the opposite side, inside the wall of the overpass.)
Every gun and weapon from the pack will be in the room..
You'll also see some testing weapons..
Not going to spoil it for you, but you won't be dissapointed.
There are two stores.
Karina's room in Novac (It's the first hotel room, right by the Vehicle outside of the hotel.)
And the stall at the Crimson Caravan Company.