bolt face

bolt face

[′bōlt ‚fās]
(ordnance)
That portion of a gun bolt that abuts the base of the cartridge case.
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References in periodicals archive ?
This will not allow the tilted condition described between the bolt face, the cartridge, and the barrel.
CRF actions can bind if the climb is too steep, because the design wants to keep the case head flat against the bolt face.
Of push-feed design, the recessed bolt face picks up fresh cartridges and slides them into the chamber as slick as the proverbial whistle.
The bolt face is recessed, surrounding the case head with a ring of steel interrupted only by a slot for the hook-type extractor.
It then operated like the Auto-5, except the shell was held to the bolt face by the extractor and flipped out when it hit the ejector, a nub on the side of the receiver wall opposite the ejection port.
For a big game hunter in need of more firepower the new MkW Anvil utilizes "the durable AR10-sized bolt face with the large case diameter of big bore calibers such as .
Headspace is the distance from the bolt face to the rear of the cartridge or case head when the cartridge is fully seated in the chamber and the bolt is locked.
So unlike a Remington, if headspace is slightly altered by modifying the receiver face, bolt face or lapping the locking lugs, we won't need a chambering reamer to bring it back to spec.
I had the extractor on one of my Nambus modified to increase the space between the back of the extractor and the bolt face.
If the extractor is not completely down, it can't grab the rounds to place them in the bolt face.
With Paul Mauser's controlled feed design, the base of the cartridge slips up and under the extractor as it is fed from the magazine, and the extractor holds it against the bolt face during chambering.
Putting that ammunition in an Accuracy International cut-rifled barrel 26' long stuck the bullets in the barrel about 16" from the bolt face.