My new G19 Gen4 has always hit about 4" low @ 15 and 20 yards. Approximate measurements. That got me curious bc I'm usually a decent accurate marksman. Searching through the forums, I found that the standard height of the rear sight on this handgun is 6.5. The factory installed one on mine is 6.1, as evidenced by the long bar and shorter "dot" below on the side of the dovetail. Someone with greater knowledge than I on this forum states that a computer on the assembly line determines the sight config. OK. I have to line up the top of the rear sights to an imaginary line about 1" back from the muzzle end of the slide to get a decent POI. Should I change the rear sight to 6.5 or 6.9? I have a sturdy table and sandbags to hold the weapon in place while I sit on a good chair. Any ideas why this is happening. No other issues are present, just the low POI. I now have about 1,000 rounds driven through it and I really like this model. Thanks in advance for any info.