Handleggr - Airsoft 40mm blunderbuss

Fires 40mm airsoft shells.
You will need m3 nuts and bolts, and some glue.
Simulate a wooden grip by painting a thick coat of brown paint and dragging a nail before it dries, then you can use various techniques (dry brushing for exemple) to make the wood look as realistic as you want.

Glue a strip of leather oround the handle for extra badassness ;)