(1) Rock River Arms 16" post-ban barrel assembly. These RRA (made by Wilson)chrome moly barrels are very high quality and have a excellent fit and finish. This barrel has a 1:9 twist and is complete with the A2 sight post , complete sight assembly and sling swivel. This barrel was mounted on a RRA A2 upper, it was properly headspaced from the factory and it was test fired by me with approx 40 rounds of M193 ammo. ( it is incredibly accurate for a 16" barrel, 2" group @ 100yds. while test firing! ) The barrel is in new condition. SOLD!!! THANK YOU!!!