So I found out which gun Fallout 3's Gauss rifle was based on. : r/Fallout
Fallout Gauss Rifle 3D model - TurboSquid 1769986
Fallout New Vegas Gauss Rifle Mods | Peatix
wz 93 Nikiel Gauss Rifle by Sleszu on DeviantArt
MrBossFTW on Twitter: "ICYMI: Fallout 4 BEST Gauss Rifle!? - LEGENDARY "The Last Minute"! #GameState #Ad https://t.co/QqTsWdDoir https://t.co/6nBYFESsCO" / Twitter
M72 Gauss Rifle at Fallout 4 Nexus - Mods and community
Arcflash Labs Offers Full Auto Gauss Rifle -The Firearm Blog