Scoped/Supressed Assault Rifle

I've made a semi-automatic scoped/supressed version of the Assault Rifle but it seems like the positioning of the scope or scope heads up display is not lined up properly with the aimpoint of the rifle.

When I zoom in on targets and shoot with the crosshair placed on their heads the shot seems to miss every time even though the spread stat for the weapon is almost zero. But then when I shoot with the crosshair placed on their chest/torso the shot seems to hit them in the head every time? Does the placement of the scope/suppressor in the .nif file have an effect on whether it's lined up with the aimpoint in game?

How do I make sure that components in NifSkope are perfectly lined up?