This mod is an extension to the weapon inventory more than inspired by Better Weapon Stats GUI (deprecated).
To get an idea of the efficiency of a weapon accross difficulty levels, the usual stats panel can be swapped with breakpoints table:
Weapons used by NPC teammates have different settings and falloff rules than players have.
DMG|HC stands for damage and average hit chance.
Also, it's worth mentioning that when a NPC shooter is under suppressive fire effects: