Gunbreaker Limit Break

[Runaes]

So to clarify since people are missing the point.
Gunbreaker's LB can not immediately go into the follow-up, it takes at least 1 GCD worth of channelling to activate the stun. Whilst not likely due to server latency and average pvp reactions being kinda meh, it is possible to CC a Gunbreaker as they start their LB and they will not be able to activate the stun and damage portion of the LB as they are CC'd. And since it's a channelled effect, just like Dragoon LB, you can just guard and negate it before the Gunbreaker can even activate the stun.
Unless you managed to purify a CC immediately before you activate LB giving you immunity, which doesn't make you immune to knockback anyway, you cannot rough divide in and get the LB stun.
The LB is heavily reliant on server tick. Your move speed boost from Rough divide will not make up for the fact that someone can literally walk away before the stun goes off and you won't get the stun even if your client says you are right on top of them.
The LB is a Gunbreaker's only source of CC. If your opponent has their purify up, you will not be able to CC them, which results in situations where an opponent can get hit, cleanse, then run off to a health pack.

[Reinhardt_Azureheim]

So to clarify since people are missing the point.
[1]Gunbreaker's LB can not immediately go into the follow-up, it takes at least 1 GCD worth of channelling to activate the stun. Whilst not likely due to server latency and average pvp reactions being kinda meh, [2] it is possible to CC a Gunbreaker as they start their LB and they will not be able to activate the stun and damage portion of the LB as they are CC'd. [3] p
And since it's a channelled effect, just like Dragoon LB, you can just guard and negate it before the Gunbreaker can even activate the stun.
Unless you managed to purify a CC immediately before you activate LB giving you immunity, which doesn't make you immune to knockback anyway, you cannot rough divide in and get the LB stun.
[4] The LB is heavily reliant on server tick. Your move speed boost from Rough divide will not make up for the fact that someone can literally walk away before the stun goes off and you won't get the stun even if your client says you are right on top of them.
The LB is a Gunbreaker's only source of CC. If your opponent has their purify up, you will not be able to CC them, which results in situations where an opponent can get hit, cleanse, then run off to a health pack.

I see your points but I need to correct and add on a bit.

1.) The minimum time between Relentless Rush and Terminal Trigger (finisher) is actually one second, 4s is the duration and the damage ticks are roughly 0.8s apart from startup.

2.) The CC should only lock out manual activation, Terminal Trigger fires automatically upon expiration of Relentless Rush.

3.) In high level play forcing Guard and Purify out is a huge advantage if your team is ready to follow-up on it. If you force Guard, it means someone else now can kill them easier. Likewise, CC placed on you with Relentless Rush mitigation up means less CC on your teammates. These are all active resources in pvp and the more you can force out the better. Even if you just force retreat to healthpack or Elixir, that is still really good since you take off pressure from your team or yourself.

4.) Actually your latency to the server has a far greater impact than server ticks alone. With 10ms you hit and dodge things with ease, 50 works too, 80+ is where it gets funky and at 120+ it feels miserable. Source - tested myself.