Not trying to be a jerk, but I'm just asking. Did you get the mod you linked, install it, and actually activate it? Also, from the creator himself (if you click on the posts tab on this mod) {SPOILER} In Goodsprings, there is a room hidden in the back-right of the Prospector Saloon, inside, you'll find a poorly maintained rifle and some ammo for it. The door is locked, however, and will cost you a little bit of karma. Enjoy!