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proofmark

noun
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Definition of proofmark

: a distinctive symbol stamped into the metal of the barrel or other part of a firearm to indicate that testing of the part bearing the stamp by firing proof loads has been carried out

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“Proofmark.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/proofmark. Accessed 25 Jan. 2021.

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