Springfield Armory Echelon 4.5" Threaded Barrel & Grip Module Kit (9mm, 1/2x28)
This Springfield Armory Echelon parts kit centers around a factory threaded drop-in barrel for any 4.5" Echelon pistol configuration. The 9mm barrel features a black Melonite coating and includes a thread protector, with 1/2x28 muzzle threads and a 1:10 twist rate.
Also included are two large-size Echelon grip modules (compact frame size and full-size frame) plus an Echelon VIS optic mounting screw kit for the Variable Interface System, and a Rook Precision compensator.