Ithaca M37

How to install:
At the moment of release GO doesn't support modding directly, so installation can be a bit tricky and you'll need to edit pak01_dir.vpk every time Valve/HPE releases a patch that updates that file. This'll hopefully change at some point after launch.

1) unarchive the materials & models folders into
steamapps/common/Counter-Strike Global Offensive/csgo/

2) BACK UP PAK01_DIR.VPK IN CASE YOU SCREW SOMETHING UP!

3) open up pak01_dir.vpk in Notepad++ or some other proper editor
(Regular notepad will probably break your pak01_dir.vpk, so don't use that)

4) Use find & replace to find all instances of shot_nova and
replace those with anything else, say, shot_novb for ease.
What this does is basically it points the VPK to a file that
doesn't exist, and forces it to load loose files - ie. my model/textures.

5) Go in game and enjoy!

edit: fixed normals