Close up view of my pencil guns trigger mechanism. Uses one internal elastic to return the trigger and latch to their rest positions. And two larger elastics to propel the piston forward and launch your projectile.
I designed this with the little pencils you get from Ikea and golfing in mind as the ammo. The barrel has a minimum diameter of 11mm and most pencils are 7mm's giving it lots of clearance.
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