Looks like the Modern Firearms mod has been removed from the NexusMods site, after a formal warning was issued against the author for potential copyright issues. The most trusted site right now is Nexus Mods.
It will work for both players and NPCs side.
Part 2 Creating an erf file for Dragon age 2 Creating an Exterior Worldspace Creating armor mashups for fallout Creating basic clothes in 5 minutes Top 10 Realistic Weapon mods. additem Fallout New Vegas has possibly the best selection of armor and weapons of any Fallout game that's been released so far. IGN's Fallout 4 Wiki Guide features a complete Walkthrough of every Quest, Location, and Secret in the Commonwealth. 4 Legendary Lamps – Lights Lamps Pipboy Overhaul. Weapons in this category include guns (pistols, rifles, shotguns, etc), blades, swords, grenades amongst many others.