Barrel relining is the replacement of a barrel’s bore by drilling out the existing rifling, adheringﾠ(soft solder or Acraglas) the barrel liner in place, crowning the muzzle, and cutting a new chamber.

aka:

• barrel sleeving (shotguns)

related:

• barrel liner (rifled barrels)
• barrel sleeve (shotguns)

Footnotes / Sources:

“Glossary ⇒.” Sporting Arms and Ammunition Manufacturers’ Institute. Ed. SAAMI’s Technical Committee. Web. 15-18 Jan. 2011.