A resource that seems to be less well-known than it should be among fanficcers:
The Internet Movie Firearms Database
What was Jack carrying in that one episode of SG-1? What is in the Winter Soldier’s arsenal when he goes after Nick Fury? If I were going to write a crossover between Universe A and Universe B, what weapons would they have – and would they be impressed by it? All of these questions can be answered here. The title says ‘movies,’ but it covers television, anime, video games, etc. You can also search by actor, weapon, or manufacturer, so, you know, if you ever wanted a complete list of weapons used by Alan Alda or Patrick Warburton in their careers… you can.
[I practically lived on this webpage when I was writing Recursive because I needed to know what the Howling Commandos were carrying, what Peggy was carrying, and the specifics of what HYDRA was firing at them. Because there is always going to be someone who will tell you if you got it wrong. 😉 ]
Internet Movie Firearms Database – Guns in Movies, TV and Video Games
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