FN America Ar-15 Button Rifled Barrel Oal M4 Black . The M4 Style Feed Ramps And Barrel Extension Provide Consistent Feeding And The Matte Black Manganese Phosphate Finish Resists External Corrosion And Oxidation. Specifications for FN America Ar15 Barrel 14.7inch Bb M4 5.56 Carbine: Manufacturer: FN America Color: Black Barrel Length: 14.7 in Gun Model: AR-15 Package Contents: FN America Ar15 Barrel 14.7inch Bb M4 5.56 Carbine The FN America Ar15 Barrel 14.7inch Bb M4 5.56 Carbine is a quality addition to the FN America lineup. For more great deals on AR15 Barrels by FN America please browse our FNH USA Gun Parts page. What firearm models does the manufacturer say FN America Ar15 Barrel 14.7inch Bb M4 5.56 Carbine is compatible with? The manufacturer suggests that FN America Ar15 Barrel 14.7inch Bb M4 5.56 Carbine is compatible with AR-15