This information came from these two links below. You should understand the firearm you own and its parts. https://www.atf.gov/file/61811/download https://www.atf.gov/firearms/firearms-guides-importation-verification-firearms-ammunition-and-implements-war-terminology Handgun — Pistol Handgun — Revolver Bolt Action Lever Action Self-Loading Action (Semiautomatic) Slide/Pump Action Top Break Action Terminology & Nomenclature To read this chapter in full, and any other articles in the Gun Sense series, … Continue reading Gun Sense #48, Nomenclature of Various Firearms-ATF