To wring the ultimate accuracy sit at a solid bench. Try a two handed grip but rest the butt on a sand bag and another bag under the muzzle. Pin it down good. Spend some time taking up the trigger and focus on those sights like your life depended on it. Equal height, equal light. Let the target blur out and keep those perfectly aligned sights centered on the blur.
With any Glock 17,19, 22, 23, 20, 31, 32, 34,35 I guarantee I can hit a paper plate at 100 yards almost every time with any American made factory ammo. If I had my 21 year old eyes back it would be groups on that plate. Now I feel pretty good just hitting one. It's amazing what a stock Glock can really do.
