05-29-2018, 09:56 PM
Usually billet uppers are square so sounds like your components are top tier. I kind of look at bolts like tires on a sports car (wear item). You drive your sports hard you won’t get the tread life. Some manufactured items just last longer than another part off the same production line. I had an extractor fail after a couple thousand rounds and now just keep spares. My rifle was over gassed and I messed up a few hand loads where I had to mortar my rifle. I figure this might have shortened the life of the extractor but I’ll really never know for sure.