I did the same as KND.. just got some Heavy duty wall hangers from the dollar store, painted them black.. rolled some electric tape around so they dont scratch.
I think it's pretty effective, as I don't see any railing or pegboard to distract from the actual showcase (I'll eventually get some pegboard and relocate them when I have a few more guns).. and the wall contrasts well with the dark colored guns.
What d'you guys think?