What is the term for the very tip of the bore that is machined perpendicular to the bore axis?

The term for the very tip of the bore that is machined perpendicular to the bore axis is known as the crown. The crown is a critical feature in firearms because it directly influences the projectile's exit from the barrel. A well-machined crown allows for an even release of gas around the projectile as it leaves the bore, which contributes to improved accuracy and overall performance of the firearm. If the crown is damaged or poorly machined, it can lead to irregularities in the projectile's flight path, negatively impacting precision.

The other options refer to different components or aspects of a firearm. The barrel is the long, cylindrical part of the firearm through which the bullet travels; bedding refers to the process of securing the action of a firearm within the stock to enhance stability and accuracy; the trigger is the mechanism that initiates the firing sequence. While they all play important roles in the operation and accuracy of a firearm, the specific term for the tip of the bore is crown, making it the correct answer.