A 5-inch-tall, 14-gauge steel drawer safe that slides under a bed frame, with a 3-8 digit keypad, key backup, and a 5-foot cable.

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Snapsafe A Hornady Company Under Bed Safe Medium Black
The Under Bed Safe Medium puts a locked drawer in the dead space beneath a bed frame, so a home-defense handgun stays out of sight but within reach of the mattress. It stands 5 inches tall on a 26 by 20-inch footprint and holds handguns, magazines, and documents. The drawer slides out after a 3 to 8-digit code on the digital lock, with a key backup if the batteries fail. The housing is 14-gauge steel with a pry-resistant door, the floor is pre-drilled for bolting it down, and a 5-foot cable anchors it to the bed frame or another fixed point when bolting is not an option.
Add the SnapSafe Under Bed Safe Medium (75402) to your build and see how it enhances your platform.