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
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Stinger Pen Pistol with Case and 22 LR and 17 HMR Barrels | Rock Island Auction
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R J Braverman Stinger Folding Pen Gun/Pen Pistol .22 Long Rifle
The Original Scorpion/Stinger Pen Gun – Small Arms Defense Journal