M249 Machine Gun

ViTaR

Hello polycounters. It's time to start a new project. And as I want to practice in hardsurface modeling I decided to make one of the version of machine gun M249, probably it will be Mk46 (as I understand, but may be wrong). The main goals is to make a detail game version of the gun. I want to make it shabby, dirty, as if it was often used, etc. Also want to do some accessories, such as optics, strap, target pointer. Here is some refs and quick blockout just to define the overall shapes sizes. 
Any suggestions and feedback are welcome.

So let's get started.