I have my pistols' dots zeroed well and I noticed that the rear sights on two guns don't mesh with the dot. I shot using only the irons and POI is off from POA. On my other guns, the dot and irons line up for windage, elevation if a bit diff--suppressor height sights. Am I correct in thinking that moving the rear sights to match the dot will zero the irons or is it just coincidence my other guns have everything line up? Thanks.