The amount of detail on this is pretty amazing. You either have an incredible amount of reference photos, or you have an AR you can look at. When you get around to baking this down, I can't wait to see the results!
The material setup is easy, I just set material specularity to 20% and diffuse amount to 40% for all- sights, screws and the handle piece itself. The more metallish pieces are set to 5% on reflection amount (blurry reflection type in modo) and the handle part (darker piece) to 1% with 20% fresnel (not sure what's the…