Tonester I apologize for the late response been super busy and have not lurked here in a while. I use 6.8 and .308 AR and A10. I have several thermal optics. I use Trijicon MK2 on the weapons and a Pulsar xp50 for a scanner cause the XP50 never has held zero. As I recall this one went to piggie heaven with the 6.8 with a White Oak Armory upper and a Rock River lower.