SCAR Rifle

This was my first serious project in 3ds Max. This motivated me to learn how to model. I have recreated the rifle every time I learned a new tool or method but only significant new methods that would make huge changes.  I have probably started from scratch  over 14 times. I need to render more because I model all the parts to this gun. The bolt down to the firing pin retaining pin. I know, the diamond pattern on the back is off center. busy in school right now and I want to create this in Maya.