How to make weapon mods?

[D3M0NW0LF]

What floppy said, and also just fool around with some models you already have (or want to download and look at). That's how I started learning (Like I took a barrel once and just started moving parts around, seeing how it was made and how it would disorientate the model). And start with basic tutorials.

Psst, good tutorial for beginners:
Q3 Tree Tutorial in Misfit3D