The skill tree talent only procs once every two seconds now, but you can actually find guns that have their own version of the same talent - lots of Jakobs guns have them.
I’ve got a legendary AR called Rowan’s Call, that gives me back 2 ammo in the magazine, for every crit, in ADDITION to the skill talent. The default magazine on it is only 20, but I can routinely fire the thing almost indefinitely when it comes to bosses with large weak points, like Graveward.
If you’ve got one round left, and pop Fade Away, suddenly you’re regenerating “free” ammo in your magazine over twice as fast as you’re using it. Select the talent that has a chance to decrease your active skill cooldown every time you crit, and you can have Fade Away ready to go again within 10-15 seconds.
This build is also pretty comical with the Flakker legendary, because you’re basically just shooting a cloud of crit-splosions in front of you every time you click the mouse - though obviously you have to reload more.