The weapon sprites from old pre-2.0 version of Quake Champions Doom Edition
This addon is based on the 1.X weapons addon made by Maggle
Moddb.com
However, the addon mentioned above modifies weapons decorate code and you can't use it in multiplayer because of that, unless the server is using the addon as well.
My version does not modify weapons code and instead just replaces new sprites with old ones. The result does not perfectly match the original animations, but it's the best you can achieve while keeping the addon optional.