Do you mean left to right, or top to bottom off center? Remember, the firing pin on a NEF/H&R strikes the primer at an angle, not inline like most shotguns. I have some of them expensive other (autoloaders, pumps) shotguns, they all are not in the center either. I wouldn't let it worry me, as long as your lock-up is tight, it goes bang when you pull the trigger, and you can hit what you are aiming at.