Congrats Fred, but don't be tricked by the barrel being marked SB2, they've been marking 357 and 44 mag barrels SB2 and putting them on SB1 frames since 2008, if it's a syn stocked factory rifle, it's probably an SB1, but even if it is(an SB1), it's still not a bad price, they're $230 new.
If it has a CAC serial number prefix, it's an SB1, otherwise, removing the stock to see the tang area surrounding the stock mounting threads will tell you if it's an SB1 or SB2, solid = SB1, skeletonized(hollow) = SB2, see pics in the FAQs.
Tim