Reloading a weapon or adding a magazine to a weapon with addPrimaryWeaponItem/addSecondaryWeaponItem/addHandgunItem triggers the Take event.
Adding attachments does not trigger the event, it's only the magazines.
In contrast the Put event does not trigger when removing primary/secondary/handgun magazine
This would be a nice start for a loadoutChanged event, so hintC 'please add loadoutChanged event, returning [_unit, _newloadout, _oldloadout, _item, _added/removed]'.. ;)
When unit reloads it takes current magazine and puts it in uniform or vest or backpack and takes another magazine from those containers, so the magazine changes and the action of putting or getting a mag from a container triggers the EH. Granted that the firing on addprimaryweaponitem is a bit odd, however at this point we are not going to touch it as it could introduce unexpected behaviour and break existing functionality in scripts. AFAIK no tweaks have been done to these EHs for a long long time.