I got the Exotic Weapon Invective about a week ago. I didn't use it much because I'm not a fan of shotguns but when I started using it I noticed the first set of upgrades are redundant and one is broken. The first is Accurized Ballistics: More range and impact, more recoil. Then Field Choke: more range and impact, more recoil. The third ( I assume broken) is Linear Compensator: more predictable recoil, slight boosts to range and impact, more recoil (?). As an exotic, having 3 interchangeable upgrades do the same thing is lame. And how can more predictable recoil result in more recoil? I have pictures but this mobile app is hard for me to deal with.
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More predictable recoil basically means the recoil is more consistent, opposed to it sometimes being harsher than the last time you fired it. Its good if you want to repeat a shot, as the gun will return to where you had your crosshair to begin with. Some upgrades won't show a noticeable difference on the stat screen, but they do change the way the gun handles/fires. This is most noticeable on guns with changeable scopes.