This weekend I ran a range for an event where the contestants used issued M17s. I use a glock normally, both myself and a very qualified shooter agreed that at 15 yards the M17 was shooting around 4 inches low. We had a couple dozen of them and we saw this across the board with them. Has anyone else who has time behind this system seen anything similar? Somehow the Greeks were dead on but I attribute this to gypsy magic.