Precision Reflex PRi AR15 - M16 Gen 3 Replacement Barrel Nut Aluminum Black. These AR15 Lower Parts by Precision Reflex are crafted from 7075 hard coat black anodized aluminum. This Precision Reflex AR15-M16 Replacement Barrel Nut is a perfect choice for anyone looking to enhance their lower receiver build with a sleek and stylish upper. Forged and designed to last the Precision Reflex Aluminum Barrel Nut will give you many years of service. When you need to replace your lower receiver's barrel nut look no further than the Precision Reflex Quick Change Barrel Nut. Add this nifty AR15 upper assembly upgrade to complete your custom build with the best possible gear. Specifications for Precision Reflex PRI Replacement Barrel Nut: Manufacturer: Precision Reflex Color: Black Gun Model: M16 AR-15 Fabric/Material: T6 7075 Aluminum Quantity: 1 Finish: Hard Coat Anodized Gun Make: AR Platform Package Contents: Precision Reflex PRI Replacement Barrel Nut What firearm models does the manufacturer say Precision Reflex PRI Replacement Barrel Nut is compatible with? The manufacturer says that Precision Reflex PRI Replacement Barrel Nut is compatible with AR-15 M16Precision Reflex 05-073-BN: PRi AR15 - M16 Gen 3 Replacement Barrel Nut Aluminum Black