I've been going around as a writer, but started getting drawn into Concept Art and 3D modeling. I'm currently finishing my studies as a 3D artist and will then be let loose on the world. Beware!
I moved the ejection port. Probably not the perfect place either, but I'll go with this. Gonna start blocking this model out later.
Only two minor things I would change is the grip and upper receiver. Grip looks like it could be more ergonomic, but the upper receiver looks like it would make it almost impossible to ADS, being almost as tall as the sight. ;)
Good point, I really dug the shape when I was starting to concept, but you're definitely right, some stuff is out of bounds. On this concept the grip looks kinda tiny too.
I'm kinda improving it as I model now. I uploaded the blockout pick of the rifle. Working on it now.