None of my barrels had the old lugs zzzzzz9bolts) anyway so I didn't have any problem. I did have to hone some of the bolts in order to switch barrels between a couple of my original Contenders, so it is not just between Original and G2. And while I have heard the complaints about G2 triggers all three of mine are just as good as my remaining original, which is to say great.
Trigger complaints seemed to be more common with the early production G2s. I heard them and prepared to do a trigger job when I bought my first one, but was pleasantly surprised. I stll have the springs, etc, but the next two haven't needed them either. I am beginning to think that the trigger rumor was spread by folks making money on the new parts.
The best advice I can give anyone is to try one and see for yourself.