Credit goes to Gravemind for the tools, 343i for Halo 4, and PepMaster for the extraction. This link is to some of the Halo 4 obj files. I am only reposting this so others can have the same access that I have.
http://www.sendspace.com/file/slwhjl
Enjoy the files. I managed to find and unfold this piece for everyone to enjoy. I'm not totally sure if it has been done already, but it should help those who want this crucial part of your Spartan armor. I'm not 100% sure on the size, but its a start. Enjoy!
Halo 4 Spartan Knife

Download Link: http://www.4shared.com/file/3OGpZWfw/Spartan_knife.html
http://www.sendspace.com/file/slwhjl
Enjoy the files. I managed to find and unfold this piece for everyone to enjoy. I'm not totally sure if it has been done already, but it should help those who want this crucial part of your Spartan armor. I'm not 100% sure on the size, but its a start. Enjoy!
Halo 4 Spartan Knife
Download Link: http://www.4shared.com/file/3OGpZWfw/Spartan_knife.html