Here's my tip:
Go to Home Depot and buy a half dozen plastic carpenter's spring-clamps.
These are like fat heavy duty clothes pins, five inches long by an inch wide. They have hinges with an allen screw going through, so you can easily dissassemble them.
Take them apart. Using small wood screws and tiny washers (so the plastic won't split) mount one half of the spring clamps to a piece of plywood about 6" X 6". Any scrap will do. Next, reassemble the complete spring clamps.
Now you have heavy duty spring clamps, that you can mount anywhere. Just screw that plywood to the backside of your bedboard, side or back or under a table, in a closet, under a desk, you name it. Even works great in cars, under the dash board or other sneaky places.
The barrel of your pistol is clamped in the gun friendly heavy duty plastic jaws of the spring clamp. It will stay there forever, even in a bouncing car. But when you need it, you just grab the grip and yank it out. (Orient the clamp for maximum ergonomic "draw-ability," obviously.)
This is a GREAT set up. Your pistol resides safe and sound, in easy reach, out of the way, in unexpected places, (like under a desk or your car's dashboard.)
(Not so great around nosy children, of course.)
Also works great with long guns, in closets, behind bed boards etc. One clamp for the muzzle end, while the butt resides on a small wooden shelf that you install. Just grab the gun and it's ready to go.
"Try it, you'll like it!"
Matt