HEADSPACE

Headspace

In firearms, headspace is the distance measured from the part of the chamber that stops forward motion of the cartridge to the face of the bolt. Used as a verb, headspace refers to the interference created between this part of the chamber and the feature of the cartridge that achieves the correct positioning. Different cartridges have their datum lines in different positions in relation to the cartridge. For example, 5.56 NATO ammunition headspaces off the shoulder of the cartridge, whereas .303 British headspaces off the rim of the cartridge.

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headspace

Noun

  1. The space between the top of the contents of a container (such as a jar) and its seal (such as a lid).
  2. One's mental state.
  3. The gap between the face of the bolt and the stopping surface for the cartridge.


The above text is a snippet from Wiktionary: headspace
and as such is available under the Creative Commons Attribution/Share-Alike License.

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