The 1911colt is perhaps the most successful semi-auto ever,it has a flat breechface why haveall the others I have ever seen,a recessed breechface?,it's an extra operation.
I'm sorry, but what guns are you talking about that have recessed breech faces?
Many semi-auto pistols feature what has come to be called "controlled feed." The Colt's Government Model (and its clones) has that feature. It requires a flat, polished breech face and a carefully designed extractor.
In "controlled feed," the cartridge rising out of the magazine is always gripped by something during its passage. First, it's held by the magazine's feed lips. Then, as it slips out of the feed lips, it's caught by the extractor's hook as it simultaneously slides up the breech face and forward into the chamber.
Because of "controlled feed," the Colt's Government Model will operate reliably in any position, including upside-down and vertical, as well as while it is in motion, for instance while experiencing externally induced vibration.
reply to va marine
As I said,every pistol[semi-auto]that I have ever seen except the 1911,has a recessed breechface.
repy to Steve1911A1
Thank you Steve,just so I understand,the polished breechface etc. is more difficult to achieve than
a recessed one?
Short answer: No.
Originally Posted by luger
I have never personally seen a semi-auto pistol with a recessed breech face.
Would you please name one or more of the semi-autos with recessed breech faces to which you refer.
(I don't believe that there are any, but I haven't yet seen every pistol ever made.)
Thebreechface of everypistol I have ever seen,except the 1911 Colt has a recess of the diameter
of the casehead,I call it a recess,what do you call it?
OK seriously, WHAT MODELS OF GUNS are you talking about.
Originally Posted by luger
When someone asks you what model of gun you're talking about, "Every gun I've seen" is not an acceptable answer if you want feedback, we don't know what the heck you're talking about.
Post a pic, a link, GIVE US A CLUE!
luger (and VAMarine);
OK, I got it...now I know what you mean by "recessed breech face."
I just did my weekly cleaning of my AMT .45 Backup daily-carry pistol, and it has what could be mistaken for a "recessed breech face." Its breech face has a kind of "lip" around its top edge, making it (I suppose) "half-recessed," if you see it that way.
So, we have to define our terms: A true "recessed breech face," as found in many push-feed (as opposed to controlled-feed) rifles, surrounds the entire cartridge head with a ring of bolt steel.
But semi-auto pistols are, most often, controlled-feed devices which require a clear and unobstructed path for the cartridge's head, as it slides up and out of the magazine and under the extractor, as it simultaneously also moves forward into the waiting chamber.
Thus, most semi-auto pistols cannot have a fully-surrounding "lip" attached to its breech face. The bottom of the breech face must remain flat, and clear of obstructions, to permit a smooth feed up from the magazine.
Thus, although my AMT .45 Backup looks as if it has a recessed breech face, it really doesn't. It merely has a lip that projects over the very top of its breech face, maybe to stop a cartridge from sliding up too far and thus mis-feeding.
Generally speaking, semi-auto pistols do not have recessed breech faces.
Now, then: Which semi-auto pistols have you been asking us about?
My CZ52 breechface has a recess that just fits the head of the7.65-25mm,or the 9-19mmcartridges
it is too small for the .38"super.
I hope this clears it up.
I'm not familiar with your pistol, so I'll have to leave this matter to VAMarine, or someone else.
...But I gotta ask: Is your pistol's recessed breech face fully recessed? That is, is the recess a full and complete circle around the cartridge's head? Or is the recess interrupted at the bottom, where the slide interfaces with a magazine-full of cartridges?
Further, it is normal (according to my experience) for a breech set-up to fit just one size of cartridge-head (in that both of the metric-size cartridges you mention have the same head diameter). The .38 Super cartridge has a different head diameter from that of the 9x19mm ("Luger").
FWIW, here is a link to a picture of a CZ 52 slide, you can zoom in for a closer look at the area of breech face.
According to the photo unpecador posted, the CZ 52 does not have a "recessed breech face." Instead, you might say that it has a "hooded" breech face, in that the slide covers only its top and left side.
But the breech face is flat, and is uncovered at its bottom where it picks up cartridges from the magazine. A "recessed" breech face would, instead, be surrounded on all sides by a projection that will completely enclose the cartridge's head when the breech is fully closed.
And, to repeat what I wrote previously, "Further, it is normal (according to my experience) for a breech set-up to fit just one size of cartridge-head (in that both of the metric-size cartridges you mention have the same head diameter). The .38 Super cartridge has a different [larger] head diameter from that of the 9x19mm."
I suspect, without firm knowledge, that the designer(s) of the CZ 52 used the slide to "hood" the pistol's breech in order to protect the user from a ruptured cartridge, especially if that rupture were to occur during the recoil-operation process. All of the force of the escaping gas would be directed downward, through the magazine well. This would ruin the magazine, and might even blow the grip-panels out, but it would save the shooter's face and eyes.
In this respect, the design of the CZ 52's slide does present some of the effect of a recessed breech face. So you were partly correct, after all.
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