HW 97/77 Tuning kit
HW 77/97 Tuning kitincludes Stainless steel spring guide, PTFE Washer, set of lubes, heavy duty breech seal, lube instructions.
Click on the options to show what gun you have. Usually the 77 has a 25 mm washer while the 97 has a 26mm washer. Best to check to make sure as I have found that some have the other size.