Springfield Armory Echelon 4.5F Factory Barrel Black. 5in Factory OEM drop-in barrel is designed to work with any standard configuration Echelon 4.5in 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. Specifications for Springfield Armory Echelon 4.5F Factory Barrel: Manufacturer: Springfield Armory Color: Black Finish: Melonite Fabric/Material: Stainless Steel Caliber: 9mm Luger Gun Make: Springfield Armory Barrel Length: 4.5 in Barrel Profile: OEM Barrel Material: Stainless Steel Threads per Inch: Non Threaded Barrel Twist Rate: 1-10 Weight: 4.04 oz Package Contents: Springfield Armory Echelon 4.5F Factory Barrel Springfield Armory EC0901-RET: Echelon 4.5F Factory Barrel Black