Gmod Tool Gun

First you have to get two prices of black foamboard and draw a revolver shape on it and cut it out with your parent.

Get a black sharpie and color all the black spots.

Get duck tape and tape it together( use different kinds to make it look more like it)!

Now get a spool of thread and duct tape it in the hole.

All you have to do is fold I've a small peice of duct tape and put it on the back.

Get a small rectangle of foamboard and put rubber band on it and attach it to the middle of the barrel.