All my Ar's have 1-9 twist, from stainless bull barrels to chrome lined h-bars, to chrome lined m4's. I have always been able to get 1" to 1.5" MOA at 100 yards out of them using 50 to 55 grain v-max or 40 and 45 gr noslers, Ive even went up to 68 grain HP, and many others, all differnt powders and charges and have only gotten 3/4 or better MOA every now and then. I have good optics so factor that out. my question is this, what bullet, powder and charge, brass, and primer are you using,YOUR MOST ACURATE ROUND. And how do you clean your barrel, like what do you use to decopper, what do you use as a solvent, and how often.