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Colt Tear Gas Pen Gun
Can a strong argument be made in a court of law for a homemade firearm that contains a semi-automatic trigger group, a non-fixed firing pin, and a rifled barrel to not be
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Bronze Zip Gun : r/NFA
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Legalities of selling a Colt's pen-style tear gas projector/launcher — GunBroker.com Member Forums
Make a Pen Zip Gun - EASY - YouTube
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Pen Gun by GundamGPO3 on DeviantArt
R J Braverman Stinger Folding Pen Gun/Pen Pistol .22 Long Rifle
Improvised firearm - Wikipedia
THE PEN GUN 🖊 (Gimmick Or Legitimate???) - YouTube
How to Make the EPG (Echo Pen Gun) : 8 Steps - Instructables