This adapter replaces the metal outer barrel and front plate on the Echo 1 Spectre RDP, allowing you to attach any 14mm CCW (counter-clockwise) flash hider, barrel extension, or mock suppressor to the replica. This also allows for the use of external tracer units, which is great for a CQB build. This is also the only true way to replace the stock plastic orange tip that comes with the gun. Some adapters are a small piece prone to loosening or putting too much strain on the barrel assembly. Since this replaces the entire barrel assembly, neither of these issues is likely to occur.