If you are going to show off your model the least you could is to disable the gridfloor or move the model above it as it honestly makes your presentation fugly. Personally I would just render the highpoly with either Blender Internal or Cycles as opposed to just the viewport as Blenders viewport is pretty bad (no AA, no AO, no PBR, jagged shadows, etc.).
As for the gun itself you should make the barrels thicker and add some holes where they intersect the receiver to make it look more natural. I would also expect some kind of eagle, skull or holy scripture as that is usually what gives these weapons some additional character. Lastly I think the grip should be rounded out a bit to make it more ergonomic as it looks pretty uncomfortable ATM.
It's a decent start but it still needs some more work.
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As for the gun itself you should make the barrels thicker and add some holes where they intersect the receiver to make it look more natural. I would also expect some kind of eagle, skull or holy scripture as that is usually what gives these weapons some additional character. Lastly I think the grip should be rounded out a bit to make it more ergonomic as it looks pretty uncomfortable ATM.
It's a decent start but it still needs some more work.