Riflespeed RS62/ 75 Gas Controls Wave Spring Stainless Steel. made in specialized factories from 17-7 Stainless Steel. If you keep spare parts on hand for repairs then add a couple of these to your kit. If you want to significantly increase the amount of force required to adjust the gas setting on your RIFLESPEED Gas Control you can nest a second Wave Spring with the Wave Spring currently installed on your Gas Control. This doubles the spring rate and makes adjustment of your Control Knob significantly more difficult. Specifications for Riflespeed RS62/75 Gas Controls Wave Spring: Manufacturer: Riflespeed Color: Stainless Fabric/Material: 17-7 Stainless Steel Size: One Size Package Contents: Riflespeed RS62/75 Gas Controls Wave Spring Riflespeed US0116: RS62/75 Wave Spring Stainless Steel