The Survivors with Robin Williams and Walter Matthau.
I say that only because I bought a whole lot of guns in that store.

[Linked Image from photos.imageevent.com]

[Linked Image from photos.imageevent.com]

I remember going in one night at the time they were filming. The store was different, things moved around. Lots of stuff on display (t-shirts and the like) that weren't normally there. Next trip it was all gone and the store was back to normal. A couple years later the movie hit cable TV and it all made sense.