Installation:
To install use open Iv and search for w_ar_assaultrifle.ydr. 
Replace the files located in Patchday3. 
Remember to rebuild archive.

These models were created by Heffy of fallout nv nexus. 
http://www.nexusmods.com/newvegas/mods/42970/?

thanks:
Heffy for great models. 
Rockstar for great game. 