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

NOTE:
Due to this model being very different from original, the scope and the silencer attachments will look bad on weapon. 

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.
TrophiHunter for youtube channel.  