In the guitar parts market, you’ll hear a lot of words thrown around that might not mean a lot. In fact, if you are new to the world of guitar upgrades and customization, some of the words thrown around might even make the process of sourcing the right parts for your instrument more of a challenge than it needs to be. One term that you will hear a lot in your search for a new bridge is “Tune-o-Matic”, which is a blanket term used to describe the typical Gibson style bridge system with individually adjustable saddles for each string allowing the user to intonate each string separately. Both the ABR and Nashville bridges are types of Tune-o-Matic bridges. The main differences between the two can be found in their adjustability. ABR Bridges The ABR style bridge is the “classic” bridge style. If you own a vintage Les Paul, Reissue or Custom Shop model, you will most likely have an ABR style bridge installed. The bridge posts are 6-32 threaded rods and will be screwed