I beleive you are right Markus. I think it's all about the Liability issue. If someone were to get injured because they swapped a barrel and the headspacing was incorrect or the lock-up was poor and they got injured, NEF/H&R would be liable. That's why they have to have you send in the receiver for the proper fitting of a barrel. You don't have to be an engineer to fit a barrel, but you do need to have a little common sense and some mechanical apptitude and then there are some folks who just don't feel confident with their ability enough to fit one. It would be nice if the NEF/H&R guns were made to tighter specs, but we would pay a little more for them. I would gladly pay the higher price for that option.