Have FUN making this gun....I did! You can make it all one colour but you would have to have a TON of lego. Its more cool in multi!! Cobra
Step 1: Stock
Here are some different angles to help you get started
Step 2: Body
One thing, the body is two bricks wide. Shown are the body side image and two of the top and bottom. If you see the white brick on the side I put that there to simulate the change to semi-auto to auto using a long brick with holes in the side. Then I put a single connector that allows for a twirling action.