i have a m&p9fs (not pro or long)with factory 3 dots, and was wondering if i wanted to do a 6'0 clock hold sight what whould i need to do, and what makes it do that. is it the height of the sight or what, i don't understand how you go from shooting the dot, to shooting the top of the post, or shooting at the 6 o clock using fixed sights. in others words if my gun's POA/POI is the dot how do i make the POA/POI the top of the post. i hope i explained that right.