This is a remix of the model by JC85. It is a scaled down version (to closer to realistic 1:1 scale). It incorporates a semi-spinning chamber that flips in and out of the body as well as a trigger and hammer mechanism.
Print and place the pegs in the holes on the body. I recommend a Gel super glue. Once cured place a small elastic between the middle peg and the cutout on the hammer.
If you need any help, comment or send me a message.