AK-29 U

Makes a good figure^^
I Like the short and compact style that delivers this future-feeling. For get a more realistig impression you could make a shown version with extendet stock(cause here it is a bit too short to be usefull). Also a great feature are furutistic scope-systems and add ons, those give a even more "touchable" feeling to the picture(like you allready did it with the clips and some cartridges). As last idea i would add a structure instead of a simple color to add some depth. A seamless structure would be great to show structured polmeres are metall(In teh basic sortiment i would advertise "Brick and Cladding->Stucco_Cladding_White" or if you like it way more spacy "Tile->Tile_Hexagon_White". But other, non-SketchUp seamless structures are most time better in quality).

So far that´s all that hit my mind - good work, go on this way and
Cheers^^