"(DIAS)... if it breaks, fixes by reputable Class 2 manufacturers are both cheap and simple... a RR... may need to be sent to a Class 2 manufacturer to attempt repair." - chetchat
"... the registered part breaks or wears out it cannot be replaced, only repaired, if possible." - ATF Rulings on subguns.com
"You can't repair a broken or fractured sear. " - Robert
Robert what are you saying, that the ATF is wrong to say that a registered part may be repaired if possible?
Or are you saying that it's impossible to repair a broken or fractured sear?