The smallest one, the Reserve, is a 700 milliamp battery that fits on a keychain and hides its 30-pin connector under a flip cap reminiscent of a Zippo lighter.

FORBES: How One iPhone Accessory Company Is Preparing For iPhone 5

The Liberator fired a standard .380 handgun round without visible damage, though it also misfired on another occasion when the firing pin failed to hit the primer cap in the loaded cartridge due a misalignment in the hammer body, resulting in an anti-climactic thunk.

FORBES: Meet The 'Liberator': Test-Firing The World's First Fully 3D-Printed Gun