Special thanks to a couple of my friends who pointed out that one area of the gun didn't make sense, and suggested putting something akin to a Magpul sight in that spot. I also had quite the struggle trying to figure out how the handle on the stock works, but I've got the shape of it down at least. I may deviate slightly from my original plan and take the gun into Zbrush to add a nice polish all over it, but I need to make sure all of my topology is finalized first. Overall I am a bit more behind on my high poly than I would have liked to have been, but there shouldn't be too much further to go.
Slightly updated ref board: