They use compensating valves as regulator. So not truly regulated as in the strict sense of the word.
Just give it enough time between shots to gain accuracy.
They can be optimized to gain more shots per charge.
Opinions and experiences vary on how, you just have to play with the stack, hammerspring yourself and depending on model the transferport.
If you want to fiddle it a bit more that is and it didn't need a going over from the start.
There have been people who've played with and consequently buggered the compensating valve up, do adjustments below the set pressure.
Definitely watch what the chronograph is doing!
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