• Version info:

Minecraft - 1.20.1
Forge - 47.3.22
Flan's Mod - 0.4.193 --> 0.4.303
Create: Love and War - 0.3-1.20.1 --> 0.4-1.20.1

• Details:

The properties of the gun part materials aren't applied to the finished guns. For example, the Precise attribute doesn't reduce bullet spread, and Hellforged doesn't increase damage.
Not just talking about the tooltip numbers, i've tested that :)