Biczooka (bolt action)

I designed this from scratch. I call it the "Biczooka"

The design effort was inspired by an aggravating little fly...

There are two printed parts. it took me about 2 hours total to print both parts at 0.28 layer height.

The printed bolt (with optional bolt extension from the inside of a Bic mechanical pencil) is inserted through the end hole and secured using one M3 screw which goes through the rails and printed bolt hole. The screw secures the bolt into the assembly and acts as a bolt handle that slides back and forth in the slots and serves as mounting point(s) for the elastic bands.

A Bic Mechanical Pencil acts as an optional barrel sleeve (outer pencil casing) and bolt extension (pencil lead and eraser holder)

It is powered by one or more bracelet loom elastic bands that hook between the slot(s) on the front of the barrel and the bolt screw. The elastics stay under tension even when the bolt is not pulled back so they stay put (until they break).

I believe it