suggested by wii.thug
http://facepunch.com/showthread.php?t=949077
maybe, if possible, you could get ahold of the maker, and ask him for the base guns of the pack, with no optics, or "E-Menu" (which allows you to change optics on your weapon)
wii.thug said that he may willingly give out the base files, as he's seen a bunch on gmod.org
look into it eh? i'd love to see a ton of new guns