The up/down gm4 run gani is really awkward, it looks like you're holding the middle of the gun instead of holding it by the handle. it would be awesome if it were fixed.
I did notice on the silenced skin that theres a weird looking handle/ ammo belt of some sort near the thick part around the barrel (kinda random thing just hanging down). I guess i've never bothered to look.
Have you ever tried using the fort knox skin? that was my fave for a long time til i got bored with it. Lone wolf is cool too.