While stock3 doesn’t have a reload penalty it also doesn’t give a bonus, it’s just a neutral reload modifier with accuracy and recoil bonuses.
Angry prefix tests for quick reload speeds. If this was stockless it’d hit that reload speed threshold and be approved for Angry instead of Raging. Raging is one of those neutral bonus “placeholder” prefixes for this accessory, while Angry is a “this gun has X stat in Y quantity; give this gun even more X”.
Raging is a placholder prefix for the Raging accessory, no bonus.
Angry gives bonus reload, RoF, and a bit of tech.