If it is mechanical it can/will break. I have a 721 that has been used abused etc. since before I was born. The bolt and extractor are still in excellent shape. As Axxe said "if it breaks, I'll fix it w/ Rem. parts for $30-40.00" ( Alaska prices can be higher) and continue on.
You have to LIVE, DIE, and PAY TAXES, and pay for what you do between your LIVING and your DYING!
An American by birth, an Alaskan by CHOICE!