For me, it's the Walther P88C, followed closely by the Walther P5. For whatever reason, those two ring the bell every time out; nothing else I've tried or own comes close (though the P99 is pretty good). Not all guns fit a person's hand and eye the same, of course, which is likely the reason why you'll see such a variety of guns listed in this thread. I've tried a few of the guns that are listed here, including a Ruger Charger, and can't produce the results I do with the P88C.