Since it isshooting low, I want it to shoot higher. Won't I want to either raise the frontor lower the back?

The guy at BassPro told me what I pretty much SHOULD do is get a cantilevered rifle barrel and attach the scope to the barrel. So let me ask you this, if I do that, the scope will go forward off the receiver and on the barrel, so will it be a problem with eye relief? Maybe there is an eye relief adjustment on the scope? Shows how much I know about scopes!