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Bar stock — Storage area containing assorted bar stock. Bar stock, also colloquially known as billet,[1] is a common form of raw purified metal, used by industry to manufacture metal parts and products. Most metal produced by a steel mill or aluminium plant… … Wikipedia
Allowance (engineering) — In engineering and machining, an allowance is a planned deviation between an actual dimension and a nominal or theoretical dimension, or between an intermediate stage dimension and an intended final dimension. The unifying abstract concept is… … Wikipedia
Headspace (firearms) — In firearms terms, the headspace is the distance measured from the part of the chamber that stops forward motion of the cartridge (the datum reference) to the face of the bolt. Used as a verb, headspace refers to the mechanism by which the… … Wikipedia

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