I like to make cardboard guns. One of the guns I made is a Colt M16 rifle.
It has a working charging handle, opening dust cover, mag release, and working sights.
How I make it is by drawing the shape of the gun on cardboard then cutting it out and gluing the different sheets together with my hot glue gun. I do this in my garage and use the leftover cardboard boxes that we get.
The Costume Kid 