What is the purpose of lapping the bore of a new barrel?

Lapping the bore of a new barrel serves the purpose of improving the finish of the barrel's interior surface. This process involves using a soft, abrasive material that is pushed through the barrel to smooth out any imperfections, such as tool marks or rough patches left during the manufacturing process. A smoother bore allows for better bullet seating, reduced friction when the bullet travels down the barrel, and ultimately leads to improved accuracy and consistency in shot placement.

The enhanced finish also contributes to easier cleaning and maintenance of the barrel over time, as residues and fouling are less likely to adhere to a polished surface. Thus, the primary aim of lapping is to ensure that the bore is as uniform and smooth as possible, which directly impacts the firearm's performance.