Sounds like you were lucky to get one with an extraordinary amount of sear engagement. They aren't usually all that bad, but may seem so if the shooter is uncompromisingly used to light crisp trigger pulls - which frankly are not a feature of 99's. It can be fixed but I'll not be the one to recommend messing with that engagement, it's a job for someone who's versed in the trigger geometry of the 99. Not a commentary on you by any means, rather a statement concerning 99 triggers in general.
No offense. I won't be trying to fix it. It needs too much to be good. It's not even close. And no it hasn't been monkeyed with
