Step 1: First
First you have to get two prices of black foamboard and draw a revolver shape on it and cut it out with your parent.
Step 2: Second
Get a black sharpie and color all the black spots.
Step 3: Third
Get duck tape and tape it together( use different kinds to make it look more like it)!
Step 4: Fourth
Now get a spool of thread and duct tape it in the hole.
Step 5: Fifth
All you have to do is fold I've a small peice of duct tape and put it on the back.
Step 6: Final
Get a small rectangle of foamboard and put rubber band on it and attach it to the middle of the barrel.