If you are talking about the NEW Ultra Light Slug Hunter, if it fits on a SB1 it will fit on a SB2 rifle frame. H&R/NEF will not fit it to the SB2 10ga/12ga USH frame. Not sure when the barrels will actually be available, but generally they assemble the whole guns before offering the barrels. I think they are going to busy with these new barrels. I will be getting at least 1 20ga, the Ultra Light and probably a Tracker II with the new rifling for close up full bore slug work. It's going to be tough to top the accuracy of my 20ga USH though.
It is also about time that they offered a 12ga that is drilled and tapped for scope mounting other than the 12ga USH.
Cookiemann,
I think he is talking about the new Ultra Light Slug Hunter.