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Watching a visual guide, such as this YouTube tutorial for a Sawed-Off Shotgun , can help with tricky assembly parts. Would you prefer: A simple 5-minute design ? A full tutorial for the working model that shoots?
Roll two sheets of paper into long, narrow tubes and tape them together. shotgun
This version features a working loading mechanism and shoots paper projectiles using rubber bands. Watching a visual guide, such as this YouTube
Create a slightly thicker roll for the body and attach the barrels to it. Watching a visual guide
Use generous amounts of tape, especially in high-stress areas like the stock and trigger, for durability.