I looked at both and the UL barrel is turned down to a smaller diameter and is shorter.
Correct it is turned (contoured) down from the normal Knight.
But, also remember in both the Ulite stock and the regular TH stock the barrel is completely floated. The barreled action rests on the cantilever recoil lug.
When it is mounted in the TH hole stock you would have a hard time telling the difference.
Here is a picture of the ULite mounted in the TH - very nice fit

And this is a picture of the different barrel contour.

Yet is does work very well in the TH
