Little things like the .140 extractor ball and the updated ejector are inexpensive updates that make your Savage run like a high class rig costing hundreds of dollars more. Down the road if you start reloading your ammo your updated bolt and receiver will better handle brass cases after being reloaded several times. Case heads fired several times start getting wear and getting rounded edges which makes them tough for the extractor to hold on to. Every little bit of quality you add will help you appreciate your Savage even more. These upgrades are quality that most people don't ever see.