By
siliconindia | Friday, 27 March 2015, 00:56 IST
2. Pen Gun
A Pen gun is a disguised firearm that resembles an ink pen. They generally are of small caliber .22LR, .25ACP, .32 ACP, .38-caliber and are single shot. Early examples of pen guns were pin-fired, but modern designs are rim or center-fire.