Bought an unfired 544 earlier this year. Have put about 5-600 rds through it. Pulled it out of safe to take to range tomorrow and checked the action-no resistance to cock in single action.
Pulled grips and saw mainspring was sheared about an inch down from hammer hooks. After pulling it from gun noticed a "ridge" running most of the length of the MS. Do you think this is what caused the premature failure? Bad casting of part? Looks like the break is right on the ridge. Kind of weird. 


Pulled grips and saw mainspring was sheared about an inch down from hammer hooks. After pulling it from gun noticed a "ridge" running most of the length of the MS. Do you think this is what caused the premature failure? Bad casting of part? Looks like the break is right on the ridge. Kind of weird. 


