Quoted:
I built a 10 gun gun rack using about $20 worth of oak and hardware. 1x2x8 oak and 1/2" oak dowels.  Tapered the dowels and glued them into holes drilled into the 1x2 at a slight angle.  Then used butterfly hardware to attach it to the wall.  It was rock solid and looked pretty good.   You can adjust the gap between dowels to get more or fewer firearms on the mount to suit your tastes as well.

<a href="http://s82.photobucket.com/user/kalski/media/The%20gun%20rack/Picture_0429.jpg.html" target="_blank">http://i82.photobucket.com/albums/j254/kalski/The%20gun%20rack/Picture_0429.jpg</a>

<a href="http://s82.photobucket.com/user/kalski/media/The%20gun%20rack/Picture_0431.jpg.html" target="_blank">http://i82.photobucket.com/albums/j254/kalski/The%20gun%20rack/Picture_0431.jpg</a>

<a href="http://s82.photobucket.com/user/kalski/media/The%20gun%20rack/Picture_0430.jpg.html" target="_blank">http://i82.photobucket.com/albums/j254/kalski/The%20gun%20rack/Picture_0430.jpg</a>

Quoted:
If you have space for a blind alcove behind a painting, mirror, etc. you could use an inexpensive rotating rack for "hide in plain sight" with decent access...

<a href="http://s2.photobucket.com/user/HardShell/media/RWB%20-%20Safes%20and%20Storage/Mirror%202_zpsbngnhusn.jpg.html" target="_blank">http://i2.photobucket.com/albums/y12/HardShell/RWB%20-%20Safes%20and%20Storage/Mirror%202_zpsbngnhusn.jpg</a>

Just one option.

Quoted:
I just ordered some from here because I don't want to spend the time to build my own.

http://7.62x54r.net/