The BoreBuddy Recoil spring tuning kit includes recoil springs of the following weights:
- 3lb (Light – BLUE)
- 4lb (Medium – YELLOW)
- 6lb (Heavy – RED)
Stock springs vary in strength, but generally are between 4-5lb in recent production bolts. These recoil springs are designed to fit CMMG/Atchisson/Ciener style dedicated bolts and conversion kits.