The P7 series, as mentioned above, as well as the Walther CCP pistols both employ this type of action - successfully.
I'd love to shoot one of those Aliens! Someone else can own it.
One thing the P7 had against it was after about a few mags, the pistol would become really hot due to the gas system being right above the trigger.
(The P8 had a polymer heat shield to help remedy this.)
This one doesn't have that problem, due to the gas system being up top.
Here's InRange TV's video on it.
P8 is the german service designation (or whatever you call it) for the HK USP. P7M8 is the 2nd gen P7 with the trigger guard lever mag release and plastic guard.