Here are some spring weight measurements from David Tubbs... just food for thought.
A2 (old) - 7.6lb closed, 14.5lb open
A2 (new) - 9.1lb closed, 16.7lb open
Tubb Flatwire - 10.5lb closed, 16.3lb open ..... since it is a flat wire.. it fits both collapsible stocks and rifle stocks
Tubb .308 Flatwire - 13lb closed, 16.7lb open .... since it is a flat wire.. it fits both collapsible stocks and rifle stocks
SpringCo White ? (standard) - 8.3lb closed, 16.3lb open
SpringCo Red (extra) - 10.5lb closed, 18.4lb open
SpringCo Orange (increased) - 13.9lb closed, 24.8lb open