RIA CS (I can accept that maybe i just got a bad one)
Wasn't all the gun's fault, more my own for not fully checking out before purchase - Looked great on the outside, but the machining on the interior of the slide and frame was horrible - looked like the bits had skittered over the parts it was cutting.
Would shoot and feed fine for the most part, but every few shots the slide wouldn't go into battery, would be about 1/8" - 1/4" shy - had to tap the back of the slide with left thumb to fully return it.
Also liked to tear up cases and wreck jacketing on the feed ramp
Traded it (and $100) for a stainless 4" GP-100 and never looked back
"The best diplomat I know is a fully charged phaser bank" - Montgomery Scott