Looking for something lighter to carry I purchased a Ruger 1911 9mm lightweight. Now for those who have one you already know that the recoil spring is light to say the least,mine would not function reliably with Winchester white box ammo. So it's time to replace the recoil spring but what weight spring,so after some poking around I settled on a 12 lb recoil spring. Went to MRA y3sterday and went thru 100 rds without a hitch. Some sights say a 16 lb spring but that seemed heavier than needed. Hope this helps anyone with the same pistol/problem