Its not a kai, but i have an old used S&W M&P folding knife that i got years ago to match my M&P pistol. The model is SWMP5LS and you can google it to see it. Its awesome looking, but the locking mechanism on its not great. Its plenty sharp but I sharpened it before i really knew what i was doing so the edge is not polished. the coating is worn as well. And the screws need tightening, i just dont have the tool needed to do it, i dont own one of those star looking screwdrivers.
All that being said it has an extremely fast flipping action and plenty of life left in it, But you would need to be careful with it because it opens when the safety is on. It might just need to be tightened, because it used to stay closed when the safety was on, so it could be a quick easy fix, i just dont have the tool to do it.
But if you want it, it would give you a great idea on fast opening folders. Just send me your address and ill ship it out after I get paid, Sorry man but i just cant ship anything right now, i just spent 95 at the post office yesterday on shipping boxes.