Painted his gray plastic gunmetal, added some gunmetal and black accents, then some light weathering. The gun is from a Gundam weapons pack with a bendy straw bit glued on to make a 5mm peg. I've been waiting for a good CHUG Ironhide and I'm really happy with him.
Well, er, I did something similar! Y-yeah. I did. I put, er, Sharpie on it! I hope I don't post this and make myself look like an idiot on the internet...