A Pen gun is a firearm that resembles an ink pen. They're generally are of small caliber (e.g., .22 LR, .25 ACP, .32 ACP, .38-caliber and are single shot.
by A R.C.D -real cool dude- February 14, 2017
Get the pen gunmug. Get the pen gunmug. Get the pen gunmug.