This BCA AR-15 Barrel is a 20" heavy profile barrel made of 416R stainless steel with a stainless finish, a rifle length gas system with a 1:9 twist rate. The barrel is chambered in .223 Wylde and machined with M4 feed ramps in the barrel extension. All Finished Barrels go through a 100% Inspection Process. Inspections Equipment includes CMMs and Air Gauges for the Bores. BCA's expectations are that our Barrels, 16 inches or longer, will hold a 1.000" MOA at 100 yards with appropriate ammo and shooting techniques.