Installation:
To install use open Iv and search for w_ar_assaultrifle.ydr. 
Replace the files located in Patchday3.
To use the folded version replace these files with the ones from the folded folder, or the one from the wood buttstock folder.  
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.
TrophiHunter for youtube channel.  