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

Terminology & Nomenclature

To read this chapter in full, and any other articles in the Gun Sense series, it is available as an Ebook and a Paperback at Amazon under:
Gun Sense Massachusetts Gun Law Information and Common Sense Firearm Safety By Mark R Shean Sr.

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