HW 100 Here's the full list of factory O-rings and the two recommended alternatives (bolded) O-ring HW 100, 37.1 x 1.6 Cylinder clamp 2682C O-ring HW 100, 15.6 x 2.5 Barrel clamp 2682B O-ring HW 100, 32 x 2 Magazine 2603A* O-ring HW 100, 13 x 2 Adaptor A 2704 O-ring HW 100, 2.57 x 1.78...