I was playing single player. Whenever I tried to shoot a gun from crayfish's gun mod or equip a scope on it, the game would crash. What strange is it only occurs when I use custom config for weapons for spartan Weaponry. If I leave the Epic fight config as standard, the game doesn't crash.

custom config (I rename it to txt since github won't read toml)
epicfight.txt

crash report
hs_err_pid98199.log

I think I found the issue, it comes from the other mod, not this one.