headspace

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headspace

[′hed‚spās]
(ordnance)
Distance between the face of the locked bolt or breechblock of a gun and some specified point in the chamber; in guns using rimless bottlenecked cartridges, the space between the boltface and a specified point on the shoulder of the cartridge.
References in periodicals archive ?
When you've finished headspacing and timing, let the bolt go all the way forward.
There is also a smart card available that gives the complete timing and headspacing procedure.
Bad headspacing and timing cause ruptured cartridges, which can lead to the M2 exploding.
If everything checks out, your M2 is ready for headspacing and timing.
I found your article in PS 634 (Sep 05) on headspacing and timing the M2 machine gun helpful.
ruined headspacing, which can cause the machine gun to explode .