I have an OLY M4gery, National Match rear sights (it came that way....16" barrel/NM sights....). It has a 16" stainless barrel with a phantom FS. I have shot appx 300 rnds through it. 1st time shooting at appx 25 yds. 1 and 3 shot into the same hole (I jerked the 2nd, my bad). Next time at appx 100 yds., 2 consecutive shots in the same hole. I haven't tried zeroing because I AM replacing th NM rear sights. But my point is the weapon is very accurate, far more accurate than me.