The AR-STONER(TM) 9mm AR-15 Buffer is perfect for your 9mm Carbine. Weighing in at under 5.5 oz, this buffer allows consistent cycling without adding additional weight. The steel construction provides outstanding durability and a wear resistant finish. Whether you are building a new 9mm AR-15 Carbine, or upgrading a rifle; the AR-STONER(TM) 9mm AR-15 Buffer is an excellent part for the price. FeaturesPerfect for a 9mm AR-15 Carbine Rifle5.5 oz For Consistent CyclingSolid Steel Construction