Well i mounted up the Holosun on the Glock and treid it out today.. its my first ever pistol mounted optic and ill say i like it a lot.. What I dont like is the f#$king Glock. I've tried different handholds, presure, finger placement, ect.. I am however consistently low n left with irons and the dot.. I'm sure I could adjust the sights to compensate but that's not the way to go.. I'll most likely pull the red dot off and find a local glock lover to give me some pointers before wasting more ammo.. makes me wish my new vp9 was optic ready, it's not a fussy gun..
Have you tried doing any work on the trigger?