9mm RO Recoil Spring Help

Windlogic's thread spurred a question.  What is the best weight RS to ensure good consistent lockup and reliable ejection for a 5" 9mm RO?  I'm anticipating replacing mine as I'm approaching 2000 rounds.

Recoil spring weight is related to pistol build! Properly fit match barrel will use lighter recoil spring than a stock loose fit barrel. Match fit barrel engages slide lugs better and retards the slide velocity more than a loose factory drop in barrel. Having said that, I believe the heaviest recoil spring that allows good reliable function from your pistol is best. Sometimes if you drop the spring weight a pound it will soften felt recoil from slide going back into battery.

Jon

Wolff-Spring-Website


COLT 1911 FACTORY RECOIL SPRING NOTES 
   1. Factory rating for super .38 & 9mm is 14 Lbs.
   2. Factory rating in .40 S&W is 19 Lbs.
   3. Factory rating for the Colt .38 Spl. Midrange is 14 Lbs. 
   4. Factory rating for the Colt Ace .22 conversion is 14 Lbs.

I think the RO uses a heavier than normal mainspring, so that may change the weight of recoil spring used. 

Kurt