Bronko22000, We are talking about the xbolt. The new features (compared to the abolt), include the new adjustable trigger which in my mind you cant really improve on and they are glass bedded from factory and the didnt change the 3 locking lugs but I think the changed the extractor and the abolt bolt rotates inside a three grooved sleeve through the middle section of the bolt, where the xbolt's entire front half of the bolt rotates.

Here is a link to the other changes,
http://www.thediyhunter.com/243-wssm...hotos-pictures