I just finally paid off my new 4" bull barrel MKII and brought it home Friday the 29th. I haven't even got to shoot it yet. I wanted to shoot it Saturday, but weather and beer intervened. Anyhow, when the guy at the gunshop handed it over to me, he said, "You're going to want to hang on to this one. You don't want one of those MKIIIs." I asked him why and he told me that a lot of MKIIIs were coming back for warranty work. He wasn't specific as to what the problems were, but he was thoroughly unimpressed with the gun.