Can't really help, ya, no one has really ever reported wearing one out, hammer springs weakened and have been replaced after 2500 rounds, sometimes sooner, but that's about it. They will loosen up at the hinge if they aren't lubed, but other than that, H&R replaces defective barrels for anyone that's had one that's loosened up at the hinge, H&R at Gardner replaced the barrel free no matter how old the rifle was, dunno if Remington will continue that tradition tho.
Tim