Error log: https://pastebin.com/Q7Sx1i8h
Whenever I try to load the game, I get this error. I also tried it without any of the other mods in my pack (except for framework), and it still crashes, although it's a slightly different error: https://pastebin.com/uT8cKYmE
I am on 1.19.2 Forge 43.2.21.

Make sure Framework library version is 0.4.2. I had other issues including these two but as far as I know if the framework version is that.. everything works.

Just tested as well. Any Framework version higher than 0.4.2 breaks the gun mod.

Based on the second log you provided, it looks like the mod is trying to load a class that does not exist (Line 81).
(Bare in mind that I know next to nothing about Java or Minecraft mod development, so take this as you will.)