imho, It is best aimed by using the top in the barrel to goal, like a shotgun/bead. For use at the hours of darkness versus a dim goal at 21 toes, I discovered it far more handy to have a dab of whit eout around the front sight. The https://gunnerscenter.com/product/beretta-px4-storm-type-f-full-size-9-mm-pistol-2/