The Heizer DoubleTap is a two-shot .45 ACP pistol that was announced last year, and subsequently shown at the 2012 SHOT Show. The DoubleTap is a very thin, lightweight gun designed for concealed carry. As it is very flat, it could make an excellent pocket gun.
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The new Heizer pistol is an all-metal gun that is fully machined. The DoubleTap can be purchased with a titanium frame or with and aluminum frame. The pistol weighs 14 ounces in titanium. In the aluminum configuration, weight drops to 12 ounces. Both versions are only 5/8″ thick.
The barrels are called “quick-changing” and allow the shooter to swap from the standard .45 ACP to a 9mm cartridge. No tools are needed to switch barrels. Barrels can also be had ported for reduced muzzle flip.