I would love to see a mod or mods that add weapons from Metal Gear Solid V: The Phantom Pain.
In particular, I would love to see the Sz.-336 SMG, I think it's a great looking smg with a distinctive Eastern European feel to it.
Here's a link to a page that gives a good description of its physical characteristics, as it's a composite of multiple real world firearms, as well as some good images of it and its upgrades.
I may edit this post to request more weapons from the game, as I have just started playing and look forward to seeing what else it has in store.
Thanks for looking,