Right now, Smith Enterprise is involved in a
real stinker of a lawsuit. You may want to look at all your options if choosing anything other than a lifetime warrantied Springfield Armory. My experiences with
LRB,
Fulton Armory and Springfield have all been great.
Overall, it's hard to beat the value an M1A has even when a $20 extractor breaks. In my opinion, that is one of those consumable parts that wears and gets replaced as you go. When it does go, replace with USGI or PB and rock on! While you are in the bolt, swap out your ejector too if u like but at least clean and grease.
My years in the M1A/M14 platform has proven them very reliable and most likely will last a lifetime for the average shooter.