According the site, the Bed Bunker Safe is a California Department of Justice approved gun safe that takes the place of a box spring. Just shove your mattress out of the way, unlock the Israeli made Mul-t-lock, and lift the 140 lb. gas spring assisted door(s) to access up to 35 rifles (70 handguns). The Bed Bunker Safe comes in a range of sizes from twin (670 lbs. - $2200) to California king (1500 lbs. - $4200).
For a hands on review, check out the September 12, 2011 Survival Blog post.