I really like this design, and if I ever get around to doing the Sci-fi campaign that I've been wanting to do I'll probably use this as a visual aid for the standard issue rifle for the my universes Terran Republic, but something about the grip and handguard:

The handguard seems a LITTLE too close to the grip, and the grip seems a little too angler. The thumb hole in particular needs more rounding out, I think. (This seems to be a laser rifle, and so recoil wouldn't be too much of an issue, but still.)

Otherwise, this is absolutely fantastic!