Hedge,
I think they started having issues with jamming and whatever they did with the second generation took care of the problem. Don't know this as fact, but heard it through the rumor mill. Sig may have had a similar problem for a brief time a few years ago. I know for a fact that Glock was having problems with the .40 when accessories were attached, but they made a change that seems to work. I'm not an armorer, but I hear them chattering about that stuff frequently. By the way the problems I have heard of were with specific models and not the entire lines of production.
