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Old 07-24-2005, 03:13 PM   #1
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Throating a Chamber?

Hi All,



I know how to lap a barrel, polish the feedramp, and polish a chamber...



I never learned how to throat a chamber. My Taurus almost feeds empty shells but it would be fun to make it actually do it.



I have a Dremel if that's what it takes, but I do not want to use a Dremel on a pistol unless it's the only way. I believe they're the #1 destroyer of firearms.



Any tips or tricks are welcome.



Thank you,



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Old 07-24-2005, 09:12 PM   #2
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Throating a Chamber?

Josh, the "throating" procedure is simply to break that edge between chamber and feedramp. As you surmise, a lot of folks get carried away with power tools. When you gently round that edge, without deeply entering the chamber proper, it should help. I'd start with a high-speed steel cutter, and SLOWLY and GENTLY remove that "edge." Then with a split rod, wrap some aluminum oxide cloth about 320grit, and polish the tool marks away.



This will pretty much optimize the "throat," a misnomer if there ever was.



To make it feed empties though, you may have to look at the breechface of the slide, and remove the extractor to correct any severe edges. In all three places, one need not remove lots of material, in fact, don't. Just take off what is necessary to reduce "operating friction" of case into barrel, case head sliding against breech, and case rim sliding under the extractor.



Lastly, I'd look at the release angle of the feed lips of your mags; they can be adjusted but best to leave that to someone who really knows his/her business. Obviously, some kind of slight upward angle that somewhat eliminates frame ramp contact is optimal but that depends on the particular feed stroke of the pistol involved.



I'm not sure if all this will really "help" a T92, they usually feed okay as is, and feeding empties is a bit of a stunt. If it's working with your carry/defense ammo, why not leave it be?



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Old 07-24-2005, 11:06 PM   #3
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Throating a Chamber?

1911dave,



Thank you. I'm just gathering more knowledge.



One brand of ammo would not feed... then I polished the chamber and the feedramp (very lightly on the Al frame as I didn't want to remove any more adonizing than absolutely necessary). It shines like a mirror now.



In addition, the feed angle was what I consider steep. I got a Mec-Gar mag. In the Taurus it sits up a bit higher than stock and has a later release for HP ammo. The mods I've done over the years were to make the pistol 100% with stock mags.



I'm very mechanically inclined and I am therefore learning all I can about this stuff. If I can find a steel frame of some sort (junk) I'd like to try stippling it. I've read how but won't try it with this Al frame.



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Old 07-25-2005, 08:29 AM   #4
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Throating a Chamber?

Josh, be wary of removing anodizing on the frame ramp; as you are well aware, that slight increase of surface hardness (if done with a hard anodizing or Type III process) can nearly eliminate wear due to bullet impact. I've seen "polish jobs" on Star PD's and Lightweight Commanders remove it entirely, and watch jacketed ammo beat the ramp pretty bad.



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Old 07-25-2005, 11:48 AM   #5
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Throating a Chamber?

1911dave,



Yessir, I agree. If the frame is blued I usually only go deep enough to take the blue off that part. I refuse to go anywhere close to 1/64".



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Old 07-26-2005, 08:57 AM   #6
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Throating a Chamber?

if the gun currently functions fine, dont mess with it. making it so it will feed empty cases may make it have difficulty feeding loaded ammo.
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