I just finished this up. I think it turned out well for something made by someone with practically no woodworking experience and only a circular saw and drill to work with.
Couldn't find a domestic seller online, but you see the stuff at wal-mart, sears, etc these days.
It's not wall mounted per se but it's meant to sit along a wall. The guns are secure, I was able to shake the whole thing fairly hard and nothing even tried to fall out. Not obvious in the pic(or even looking at it) but there's a thin strip of wood on the bottom in the front that makes it sit tilting very slightly backwards and that seems to make all the difference.
It looks pretty good! I made the same sort of thing myself out of 2 x 4s, albeit a bit cruder, and I put a small box around the base to be able to lean my rifles.