Originally Posted by Suzukiphil
The money issue is probably closest to the truth. Cheaper barrel, and no regulator would be my guess, plus generally cheaper build.
If by that you mean that a barrel used in cheaper rifles affects the BC of the pellet in a deleterious way then you're probably right (and just restating what I said above with slightly less detail).
I wouldn't have thought that the lack of a regulator would mean an overall and consistent difference in trajectory. Why would it? unregulated PCPs in the their sweet spot can actually be more consistent in FPS terms shot-to-shot than a regulated rifle.