Decided to start really practicing my hard surface modeling, and thought this concept from Interstellar Marines might be fun.
There's some other stuff I want to get modeled right now, so will probably come back to this later and texture it. Leaving as a high-poly exercise for the time being.
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The only thing I'd remark, is for the sake of normalmaps, you might wanna soften some edges a bit so they translate better when you bake.
The part that rests on your shoulder seems a bit wider in yours than in the concept, and the barrel in yours is almost an entirely different shape. I noticed the barrel on the concept gets smaller twards the end where yours doesn't, and then noticed the part of the barrel that actually "connects" to the gun and how it differs between yours and the concept. I dunno if you made that change on purpose or not, but I think the concept version looks better.
Other than that it's lookin pretty good, nice work sir!
Made some adjustments:
Not sure how you're supposed to look through that scope though, with that thing behind it.
Here's some crits if you're trying to stay 100% true to the concept:
1. The gun overall is slightly too tall and also too thin (it looks to be about 75% as thick as it should be). Look at the front of the gun where the barrel protrudes, it should be just about square whereas your's is very elongated.
2. You have what looks like twice as many rails.
3. Most of your edges seem too harsh compared to what looks like smoother ones. The flashlight for instance is much more rounded in the concept.
4. The suppressor is tapered, your's is not.
5. The grenade launcher attachment doesn't taper in the concept and is smaller than the object that holds it in place. Also the attachments aren't accurate to the concept -- same with the flashlight (?) on the side. Proportions are off. Also missing an inner bevel on the flashlight bracket.
6. The flashlight seems to sit too far away from the bulk of the gun.
A real rail has a sort of stretched hexagonal cross section: http://www.airsoftpost.com/images/large/RIS_UTG_HG416S_B_lg.jpg
You could change it up some but you will want to keep that lip on both sides that the hex shape provides.