Wow is it my shooting or are the non-adj sights Glock puts on it's pistols way off? Now mind you I dont consider myself a marksman by any means but from 10yds I can usually keep a group under 6-7inches ,I took out all three of my models yesterday a 21sf,22rtf and a 17rtf,love the feel of these pistols but was just disappointed with the results,mind you reliability was there not a single issue, the one thing I found on the 21sf was that's it was shooting about 5'' low,so what I did was covered up the rear sight with some black tape ,so as to be able to compensate for the lowered front sight at point of aim.my question is does anybody have real good luck with the set factory sights ,or is it worth my denero to invest in adj-sights for all my glocks? Thx in advance.