Bootleg Gunz:The Bazaar of Bizarre Guns - "A .22lr pen gun made from a $3 automatic center punch tool. The key ring is simply pulled back and released to fire. These same
Homemade Pen Gun - HomemadeTools.net
Fears crooks could use lethal James Bond-style pen guns to shoot cops from close range | The Sun
TSA Confiscates .22 Caliber “Pen Gun” in Carry-On – FlyerTalk - The world's most popular frequent flyer community