Ok, i'm basically looking for affirmation that what I am thinking is correct. I have previously owned 2 glocks, G23Gen3(stolen) and a G27Gen3(sold). I now have a G22Gen4 and a G23Gen4. They both were purchased from the same blue label dealer, both were blue labels, and both had the orig sights removed and replaced with night sights by this dealer. My gen3 g23 i did not have any trouble with. After the theft things got in my head and so i never did shoot the g27 very good, i believe combination of small gun and psych was the problem there. i did have some low/left tendancies with that gun. So i get the 22 and 23 gen 4 as i liked the slightly smaller grip. while shooting them i am getting low/left tenancies. I have been working on my grip, stance, trigger control, etc. My groups are improving immensely, but still low/left. Example... 45rds 10yds So i am figuring since I am doing it with both guns, it isn;t the guns, it's me. Until tonight. My best friends mom bought a brand new g19gen3. still has factory sights on it, we put the first 100rds through it tonight. I shot it and here is what i did... 15rds 15yds so then i put her 19 down and grabbed my 23gen4 and this is what i did....13rd 15yds So heres my thinking, if i can do that with her gun with orig factory installed sights, i have eliminated the low left stuff. when i switched to my 23, the low part is gone but the left is still there. I am thinking both sets of sights were probably done by same person with same tool. is it possible i just need a rear sight adjustment? i didn;t wanna jump to that to quickly as i wanted to correct problems with me rather than compensate for them. am i on the right track?