Problem with GM/GMA files

I’ve been trying for probably an hour to extract the files from GMA/GM filetypes downloaded from the GMod Steam Workshop. I have tried to use GMAD, G-GMA Extractor, and GMADConv but to no avail. I am really just trying to get it to extract the MDL and VTF files, so I can use the 3D models for my other purposes (3d printing and pepakura). The error I keep coming across is “There was a problem parsing the file”. I’m not sure if this could be a Framework issue or some other problem but I’m really hoping someone here can help, or at the very least extract the files for me, make each a ZIP or whatever and upload to Mega.
Here’s the link to the weapons I’m trying to get extracted. http://steamcommunity.com/sharedfiles/filedetails/?id=504283249
Thanks to whoever can help me.

Iunno how to help you with that (I use GMPU to unpack addon files which so far worked 100%) but i can extract the files and zip them up if you want.

EDIT: https://dl.dropboxusercontent.com/s/qf5lh4d4al8dc42/halo5_guardians.zip propably too many textures, but whatever