We carry ten of them at this point, so if you want specific details on a particular one send me the SKU and I'll try to answer your question. Generally, the melonited stainless barrels are 1:8 twist and the melonited chromoly barrels are 1:7 twist. All are 16" barrels, the Medieval muzzle brakes aren't perm attached, and mid-length gas systems. BCGs are standard AR-15 and phosphate finish, nothing fancy there, and the charging handles are mil-spec.
A friend of mine picked up one on Black Friday sale last year and says with match ammo it's one of the tightest shooting 16" uppers he's ever had, and he's super picky. He thought it would just be a cheap 50 yard blaster but after he tested good ammo through it he re-tasked that gun and put a Nightforce on it instead, now he shoots the expensive stuff through it exclusively. That's just one guy, a sample size of one, but it makes me want to buy one of these uppers for myself because I know how high his standards are.