Nice job on this gun man, really cool looking. I watched a guy on you tube build one of these and he made his paint looked like it was chipped in order to make it look like it had been in the field for awhile. After priming his model, he sprayed painted it black. After it dried, he then sprayed it with hair spray. When he did that, I was like what in the world are you doing..LOL...I kept watching and he began to put on the regular color he wanted for his model. He then took an old paint brush and began dabbing the bristles in various areas. Doing this caused the paint to rub off in small portions and making it looked like chipped paint. It was pretty cool. I just thought about sharing that with you in case you ever wanted to do chipped paint on another diorama project. If you want to watch some videos about the person I am talking about, his name is qdc748 on you tube. He is pretty cool with his models.