Three D Weapon - MSBS 5.56
I'm happy to say that I also entered into the Competition.
I picked a great Polish assault rifle MSBS 5.56 (Modular Firearm System 5.56 mm calibre, also known as Grot).
It has a very interesting and futuristic design so I think I will have much fun with it.
Here are my references:
My Artstation page www.artstation.com/alav