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Thread: Smith carbine flash channel screw length?

  1. #11
    Kevin Tinny is offline
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    Hello:

    Lots of interesting stuff here, but can anyone please tell me why there are three extra threads on the ORIGINAL screw in my original Smith that project well into the opening below the nipple and reduce its opening by roughly 50%?

    Wondering why the factory would have done that.

    Anyone else found the same thing, please?

    Thanks,

    Kevin Tinny

  2. #12
    Lou Lou Lou is offline
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    Kevin, to direct fire to the bouche
    e
    Lou Lou Lou Ruggiero
    Tammany Regt-42nd NYVI

  3. #13
    Kevin Tinny is offline
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    Thanks, Eggman:

    Another skirmisher has shared off-forum that he has observed the extra threads in unaltered originals.

    Perhaps they deflect excess flash that would otherwise erode a depression that could hinder consistent ignition?

    My ignition with the extra threads in place is fine with never a hang-fire or failure.

    Guess my curiosity has devolved into how many angels can dance on the head of a pin.


    Thanks,

    Kevin Tinny

  4. #14
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    Pictures tell this

    Although rusty this picture shows an original Mass Arms hole. Notice the nipple recievers threads do not enter into the side screw cavity. The bottom is machined concave to extactly match the bottom of an original nipple. The side screw body does enter into the flash channel hole maybe a millimeter. Never looked at repros much, but think the theads in the recievers may go too deep?? Are the nipples used in them flat on the bottom or slightly rounded like originals?
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    N-SSA Member since 1974

  5. #15
    Kevin Tinny is offline
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    Thanks, Bruce:

    Pictures are worth lots of words.

    My original has both a rounded base on the nipple and a corresponding dished hole.
    The original and repro b-copper nipples fit quite closely against the opposite surface with only tarnishing, not crusty fouling showing on the nipple.

    My "screw" threads show the same form of projection into the flash channel just below the flash hole as in your photo, but mine is approximately 1/3 more so that one-half of the round hole is obstructed. The underside of the head of the screw bottoms against the shoulder in the hole and the screw head is neatly flush with the outside of the bolster. This tells me the screw fits correctly.

    My take on this is that your photo's appear to confirm that this seemingly extra projection of threads is common on unaltered originals with original screws.

    Again, I wonder IF this was intentional, perhaps to reduce erosion opposite the flash hole.

    All the best. See you in Oct at the Nat'ls.

    Kevin Tinny

  6. #16
    John Holland is offline Moderator
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    I think perhaps we are overthinking the whole thing! These arms were manufactured quickly to fill the expediency of arming troops in the field. Their life expectancy was some 18 months, or so. I really don't think applying modern manufacturing techniques and expected longevity are applicable!

  7. #17
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    Yes

    Materials and heat treatment back then were still in the dinosaur age. Lots of things got too soft or so hard they broke easily. We fire our firearms far more than they ever thought possible. And yes, things just wear out.
    N-SSA Member since 1974

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