Knights Armament M5 Rifle Length Rail System. Also Can be used for Bushmaster Dissipator 16" Barrel.Used rails with 4 Like New Panels and ProMag Grip. Complete and no broken or missing parts with Box. Shows wear on front Picatinny from mounting sights and laser. Use panels to cover up if not using these areas. Manufactured 5/19/01 at Vero Beach Florida Plant Free Shipping.