When you order a Broomfield Arms barrel, you're ordering a barrel that has been cut, rifled, and assembled entirely in Bolton, MA and individually inspected and air gauged to ensure it meets their stringent specifications. Manufactured from durable 4150 Chromoly Vanadium steel and finished with a quality Manganese Phosphate for extra durability. All Broomfield Arms barrels 16" or longer are guaranteed to hold at least 1.000" MOA at 100 yards with appropriate ammo and shooting techniques.