A work in progress MP5SD weapon, which was modelled by DarkDali, textured by BuLL, and has been rigged/animated by myself. It's currently ingame (as seen in the below screenshots) with a few animations completed, and I'll continue to work upon further animations for it. The material also needs some tweaking still. I believe it will be scheduled for a community release, once completed.
EDIT: A video demonstrating the weapon can be found in this post.
EDIT 2: The weapon has been released, and can be found for download here, or here!