I bought these Talley mounts for my .260 build on a Remington 700 action. I searched for information about lapping and got differing opinions on everything I read. Ultimately, I chose to lap mine for piece of mind and I didn't want to chance ring marks on my new Vortex. From the pictures, you can see that this was the correct decision. This is not a knock on Talley but just an example of what can happen when you mate mass produced items that are not custom matched to one another. Being a machinist by trade, I can say that just because the Talleys are CNC machined doesn't guarantee perfection. You still have the human element involved in tool and part setup. It is also well known that 700 actions have their share of imperfections. For these reasons, I recommend lapping regardless of the make or style of mounts you choose. I think the Talley mounts are an excellent choice for a solid, affordable mounting option and lapping will ensure that they are the best they can be.