Went to the range and asked the range master to help zero my red dot sight. the gun was firing up, I told him if you are adjusting the rear sight you have to move up as well because your view from the back indicates that you are looking from a lower level that's why the muzzle was pointing up so you adjust the rear sight up as well to level it... Anyways long story short He couldn't do it and I couldn't do it either. what the heck? What is the proper way to zero the sights and do I have to adjust every single time if advancing from 25 to 50 yards??