The trigger/cocking mechanism on those 99's is something to behold - the sear kinda floats around looking for something to grab onto

- new shooters should study just how little metal prevents the firing pin from falling - I used to teach Firearms courses and I would set a mouse trap and have the class pass it around, kinda gave them some idea just how touchy a trigger really was - the sear mechanism should have very little if any side play - you can fix that with a thin washer between the sear and the receiver this will help with the 'let off' - stoneing will help but any one I've seen is pretty smooth, just take the wobble out of it -