I just called H&R and they indicated that the Sporster 22lr is drilled and tapped (eventhough there is no mention of it in the 2007 catalog).
However, it no longer comes with the sope rail as it did in previous years.
I ordered one from Walmarts last weekend and hopefully it will be here by next weekend.
When it arrives, I'll update this post to confirm whether or not it was D&T.