I have a MK II 10" gun that is one of my favorites. I bought a MK IV 6"as soon as they hit the gun show tables. It was the single worst trigger I have ever experienced on a gun. I immediately put a Volquartzen trigger in it. I ended up up sending the whole thing to them and having it converted to their custom Olympia model. The MK IV was such a good idea, but that trigger just really put me off.