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Barrel Proof

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Barrel Proof

A named craft tool / part lemma (Barrel Proof) drawn as an exact public-domain workshop phrase.

Barrel Proof is historically related to Marble.
gunsmith-manual seats orphan barrel-proof beside marble as a first craft peer — object speech, not a text-container or tradition dump.
from J. P. Stelle & William B. Harrison · The Gunsmith's Manual, PD Gutenberg #71928
historically related to · sourced · documented

sources

The Gunsmith's Manual · J. P. Stelle & William B. Harrison
Stelle & Harrison, The Gunsmith's Manual (PD Gutenberg ed.).