The Freak barrel system Features Front Aluminum Back 1 Inserts, Choose From: .679, .682, .684, .687, .689, .691, .693, .695 The Freak is a 3 piece barrel system which has been designed to suit the needs of the professional player in any situation; by changing the relevant barrel components. All parts of the Freak barrel system are interchangable for all conditions. Different inserts for different size paints, different fronts giving different lenth and colours and Freak backs to suit your style of marker. All multi-piece barrels are cross-compatible for mix and match construction.