The barrel has male threads and screws into the receiver's female threads. The shoulder of the barrel stops at and presses against the end of the large ring of rifle receiver. Some rifles have an inner "C" stop ring that is where the breech of the barrel presses against.
Newer cheaper rifles do not have this feature. I is very hard to machine this feature into a receiver.
TIA Clark
Anyone?
These forums had Mauser opinions:
I assume you're talking about Mausers with the inner diaphragm. Mostly this is an aid to barreling, in theory, all spare barrels can be chambered to the same depth and they'll work, an advantage with military arms. Everyone else's had to be checked and headspaced with a reamer after barreling since they seated on the barrel shoulder, not the barrel end. These days with a Mauser action, you can check gauge protrusion with a depth gauge on the old barrel, chamber to the same specs on the new barrel in the lathe and theoretically have the same headspace when the new barrel is wrung into the receiver. Assuming the original headspace was correct, of course. The only thing that beats it is the Savage-type barrel nut. There's some gas-handling stuff that's better with the Mauser system, too. Like you say, it's a hard-to-machine feature, most current made Mauser-type actions either don't have it at all or it's been modified for production and doesn't do everything the real deal Mausers do. Ludwig Olson wrote a pretty good book on Mausers and their action features. It's an expensive proposition to duplicate all the features of the action these days.
Stan
According to de Haas' "Bolt Action Rifles", regarding the breeching of the M98 rifle,
"Normally, the barrel shank is made to butt tightly against this collar so that the shoulder of the barrel need not nor should contact the front edge of the receiver."
David
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