TK017 TWC Ultra Tuning Kit for HW77 and HW97 Early Models
This kit is for the early models with a serial no below 1301036 for HW77 (25mm seal)
This kit is for the early models with a serial no below 1375964 for HW97 (25mm seal)
This kit contains all that is required to Ultra Tune your weapon, including standard mainspring or upgraded mainspring please choose your preference when ordering. Also includes Ultra Spring Guide, Top Hat, Piston washers, Breech/Transfer seals, Ultra grease & lube, along with full instructions & parts plan.