I dont know much about weapons, but is there any weapon in Fallout that was designed after the 50?
Weapons ostensibly designed before timeline break (~1960)9mm pistol - Browning Hi-Power
.357 Revolver - Colt Single Action Army
.44 Magnum Revolver - S&W Model 29
Police Pistol - Colt Police Positive
Automatic Rifle - Browning M1918
BB Gun - Daisy Red Rider
Brush Gun - Marlin Model 1895
Cowboy Repeater - Winchester Model 1873
This Machine - M1 Garand
Trail Carbine - Winchester Model 1892
Varmint Rifle - pick any generic bolt action .22
9mm SMG - M3 "Grease Gun"
Caravan Shotgun - pick any generic over-under shotgun
Hunting Shotgun - pick any generic pump-action shotgun
Lever-action Shotgun - Winchester Model 1887
Sawn-off Shotgun - pick any generic double barrel shotgun
Single Shotgun - pick any generic break-action single shotgun
Weapons ostensibly designed after timeline break that exist IRLHunting Revolver - Magnum Research BFR
Silenced .22 Pistol - Ruger MkII
Anti-materiel Rifle - PGM Hecate II
Assault Carbine - Colt CAR-15
Hunting Rifle - Remington 700
Marksman Carbine - Colt M4
Service Rifle - Colt AR-15
Silenced .22 SMG - American 180
Riot Shotgun - pick any generic semi-auto shotgun
Mini-gun - General Electric XM214
Weapons ostensibly designed after timeline break with no close RL counterpart10mm Pistol - vaguely resembles modular pistol of current day, e.g., H&K USP
12.7mm Pistol - chambered for same round as IMI Desert Eagle, with no other similarities
That Gun - resembles Blade Runner pistol
Sniper Rifle - vaguely resembles modern rifles, e.g., XM2010
10mm SMG - vaguely resembles modern SMGs, e.g., Vz-61 Scorpion
12.7mm SMG - vaguely resembles TDI Vector.
Light Machinegun - vaguely resembles modern squad automatics, e.g., M249 SAW
All Energy Weapons
All references to RL weapons are merely my impressions or from info released by devs. You are welcome to disagree. Did I miss any?
-Gunny out.