Someone on a board I think in Texas a guy claimed that the 9mm ECO uses an 18 lb spring and the .45 a 22 lb one. He said he had contacted DWA and that is what they told him.I, too, would like to see the recommended recoil springs for ECO's in .45 ACP and 9mm. The ratings for somewhat similar Kimber and Colts seem to vary all over the place.
See post #19:Since this was not addressed, I am bumping it up.
I also need to know what the spring weight is on a CCO?
http://forums.1911forum.com/showpost.php?p=2504980&postcount=1923# Officer's Model spring.