Just my shot at making a concept machine gun using a couple of interesting tools like bevel and solidify along with classic old extruding. I used the following material packs since they save me so much work with nodes.
[http://www.blendswap.com/blends/view/69793
](../view/69793)and of course my all time favorite. http://www.blendswap.com/blends/view/47497
Awesome work! Thank you for sharing.