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: https://www.instructables.com/id/Lego-Atlas-And-P-Body/
Step 1: The Pieces.
Listed in these two pictures are the pieces you'll need to build this.
Step 2: The Barrel.
First is the barrel and the prongs.
Step 3: The Body.
Now the main body of the gun.
Step 4: Attach the Barrel to the Main Body.
Here is how to attach the barrel to the body.
Step 5: The Stand.
I figured out you could build a stand for it with the extra parts.
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.
Step 7: Done!
Now your finished! Enjoy blasting your Lego guys with portals!
Here are some different views of the gun.