This will show you how to make a Portal gun model from the video game Portal, using lego. (no it doesn't work)

It features interchangeable colors, blue and orange. (step 6)

The steps are in the photos.  I have highlighted the pieces you need to add with each step.

Includes optional stand. (step 5)

See also:
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Step 1: The Pieces.

Picture of The Pieces.
Picture 648.jpg
Listed in these two pictures are the pieces you'll need to build this.

Step 2: The Barrel.

Picture of The Barrel.
First is the barrel and the prongs.

Step 3: The Body.

Now the main body of the gun.

Step 6: Interchanging Portal Colors.

 As you know when you shoot a portal the glowing parts change color, here you can change the blue and orange colors.