Okay two things cause this (idk about your Gjally man I've never heard of that): 1. Explosive Rounds (previously mentioned) Getting a kill with the non-precision part of the explosive round won't trigger Firefly/Outlaw. 2. Perk Timers So basically when you get a precision kill it activates Firefly/Outlaw. Firefly is instant, but Outlaw lasts a couple seconds. The problem with this is that it doesn't reset with every trigger. Outlaw only lasts those (three?) seconds, and then it's done and you can trigger it again. So say you kill three things with precision shots. The first one activates Outlaw, and the next two are within those following seconds, and by the time you go to reload, Outlaw is no longer active and it takes the usual time. I hope that makes sense. This happens with Feeding Frenzy and other perks as well.

Drop that horrid explosive rounds on fatebringer. That is what's causing it and it's nothing but trouble. Why would you need explosive rounds when every headshot causes a major explosion anyways? I have encountered outlaw not processing very occasionally, sometimes due to a critical and reload then another quick critical and reload, sometimes very rarely it doesn't activate with all the mayhem of fast reloads and multiple enemies and a lot of on-screen action but it's really rare. The old school guys have discussed this issue and its not necessarily a bug, it's that sometimes I'm guessing even a headshot with fatebringer the explosive rounds area of effect hits the target a split second after the headshot but before the target death registers, so the game thinks your final damage on the target wasn't a critical hit kill but a standard damage hit. The end result? All of us longtime fatebringer users run snapshot or field scout. FS only adds one round but it's my usual middle tier perk, just because i don't like the move faster when aiming down sites perk because I'm so used to movement speed when ADS with every other standard weapon. Just personal choice, although the switch weapons faster is worth it if you can adjust to increased movement speed when ADS. Test both and see what you prefer after lots of sampling.

It can happen when you use explosive rounds. The bullet will do some damage, and then the explosion finishes the enemy off. If this happens, it doesn't count as a critical hit.

Your not using explosive rounds are you ? That can mess with fatebringer perks.