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Thread: 80% build brass dust problem

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  1. #11
    Join Date
    25th September 2011
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    It is difficult for me to tell from the photo. Is there some shaving of the primer on the round on the far right? I have Ruger LC9 where the firing pin hole occaisionally shaves the primer.

  2. #12
    Join Date
    2nd June 2004
    Location
    Terra
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    Quote Originally Posted by niemi24s View Post
    Another method of checking headspace without a go-nogo gauge goes like this - if you have a slide caliper with a depth rod or a depth micrometer:

    • With the gun in battery, measure the gap between the barrel hood and the breech face.
    • Remove the barrel and clean it well, paying particular attention to the chamber stop shoulder area.
    • Measure the distance from the barrel hood to the chamber stop shoulder.
    • The sum of those two distances is the static headspace of the gun and it should be from 0.754" to 0.776"
    Another way to check headspace is the remove the upper assembly from the receiver and assemble the barrel and barrel bushing into the slide. Put a round into the chamber and manually push the barrel into battery. From the underside, see if you can fit an old-fashioned automotive feeler gauge between the case head and the breech face.

    Try it with the barrel held forward, and again with the barrel held to the rear.
    Hawkmoon
    On a good day, can hit the broad side of a barn ... from the inside
    Last edited by Hawkmoon; 10th June 2019 at 01:03. Reason: Typo


  3. #13
    Join Date
    2nd December 2004
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    The surface of aluminum is a layer of aluminum oxide.

    The same aluminum oxide used to make abrasives.

  4. #14
    Join Date
    26th December 2015
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    near Annapolis Maryland
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    I've checked the headspace and it is good. Also smoothed the breech face (it was pretty rough). Haven't had time to go thru the timing tests, so I will probably take it to the range on Friday or Saturday and see if I've made any improvement.

  5. #15
    Join Date
    20th December 2010
    Location
    West Michigan - Ottawa Co.
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    Quote Originally Posted by [URL="http://biblia.com/books/NIV/Mark75"
    Mark75[/URL]H;993419]I've checked the headspace and it is good. Also smoothed the breech face (it was pretty rough). Haven't had time to go thru the timing tests, so I will probably take it to the range on Friday or Saturday and see if I've made any improvement.
    Good plan, one thing at a time or, if corrected you still will not know what was causing it.
    "Where is the wisdom that we have lost in knowledge?" T.S. Elliot
    Dominus Vobiscum . . . <))>(

  6. #16
    Join Date
    26th December 2015
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    near Annapolis Maryland
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    Got to shoot it a couple times since last year, but forgot to collect spent brass until this week. The cleaning up of the breech face was the biggest improvement, but there was still a little dust showing up.

    Brass is now remarkably free of marks - shows that the breech face and extractor were both making marks. The only mark remaining is the ejector. The ejector has to make some kind of mark - but its not a simple dent, its a scratchy dent. I'm getting ejection that I like, but apparently the tip isn't smooth and is not only hitting, but also scratching. I knew the ejector was rough when I installed it, but was impressed with the action so I forgot that the tip was actually unfinished. I need to look carefully at good ejectors before I smooth this out with a stone.

    Many thanks for all the help here!
    Last edited by Mark75H; 30th June 2018 at 09:11.


  7. #17
    Join Date
    26th December 2015
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    near Annapolis Maryland
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    Stoned the tip smooth and took the gun to the range again. Now I have a cleaner ejector mark on the cases and not a speck of brass debris in the gun.

    Appears the main problem was the rough breach face of the Rock Island slide and the fit being slightly tight.

  8. #18
    Join Date
    26th December 2015
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    near Annapolis Maryland
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    Started seeing a tiny amount of very fine brass dust again but puzzled where it could be coming from. Saw a picture on another forum of correct extractor to case fit. The nose of the extractor was still touching the cases so I shortened the nose again so that it clearly clears every case. Now I worry that the tip of the hook may be too sharp and break sometime in the future. Will be keeping a close eye on it - and considering trying a replacement.

  9. #19
    Join Date
    25th September 2006
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    Saw a picture on another forum of correct extractor to case fit.
    Correct according to whoever posted the picture, but not correct according to either Colt or Army Ordnance.

    FWIW, an M1911 built to mid-spec Army Ordnance dimensions will see the tip of the extractor hook in contact with the extraction groove bevel when the gun's in battery. My suspicion is that it was designed for that contact to push the chambered round forward against the chamber stop should for a more solid firing pin strike.



    Most here shudder in horror at such a condition. My wadcutter gun's been making such contact since the 1960's without a problem, so I don't sweat the small stuff.
    When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
    Likes (1) :
    Mark75H (9th June 2019)

    Last edited by niemi24s; 9th June 2019 at 15:48.


  10. #20
    Join Date
    21st September 2008
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    Interesting thread. My Para P18.9 also shaves brass from somewhere. It too is chambered in 9mm. It has been doing it either from the start or for a very long while. It's otherwise reliable as can be.
    Too many people miss the silver lining because they're expecting gold.
    M. Setter

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