Eric,
I'm in agreement with Brian....front plate gap (easy fix) and the optics (again, easy). An addition....the third pic down (front view looking down the barrel). It looks like it's plugged...you can see where the barrel is solid. Quick fix: paint it black, or better yet, drill it out some. A drill, with the correct diameter bit (on SLOW speed) will open it up nicely. Funny, always been one of my nitpicks: barrels (be they machine gun or main gun) not "opened"). Other than that, dirty up the decals some and "she" looks like one that has been through some action!
Merely my penny's worth.
Mike