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This Pen Gun redefines the Concept of Concealed CarryThe Firearm Blog
Pugio PEN-15 AOW Pen Gun - Aklys Defense LLC
THE 'ZIP' GUN
Pen Gun Assembly | 3D CAD Model Library | GrabCAD
What Is A Zip Gun? Should You Make One?
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