The Chamber-Safe, from Rocky Mountain Tool & Armory, renders a handgun inoperable by blocking the chamber via a locking metal rod with an expandable tip that is inserted into the barrel. Unlike trigger locks, the Chamber-Safe cannot be installed on a gun that has a cartridge in the chamber. Installation and removal take less than five seconds. Made of aircraft-grade metals with custom-key high-security lock. About 430; call 714-848-3234.