Springfield Armory Echelon 4.5F Threaded Barrel Black. 5" Factory OEM drop-in barrel is designed to work with any standard configuration Echelon 4.5" 9mm pistol and features a black Melonite finish for rust-resistance and lubricity. This barrel is for any shooter who may have purchased a threaded barrel model Echelon and now wants an original standard factory barrel for their shooting needs. For use in any 4.5" Echelon pistol configuration. Some state restrictions prevent the sale of aftermarket barrels please check your local and state regulations. Not available to CA residents Specifications for Springfield Armory Echelon 4.5F Threaded Barrel: Manufacturer: Springfield Armory Color: Melonite Additional Features: Threaded 1-10in. Twist Package Contents: Springfield Armory Echelon Replacement 4.50in Threaded Barrel Springfield Armory EC0901TB-KIT: Echelon 4.5F Threaded Barrel Black