A thread about threads!

Discussion in 'Percussion Rifles' started by longcruise, Jan 12, 2020.

Help Support Muzzle Loading Forum by donating:

  1. Jan 12, 2020 #1

    longcruise

    longcruise

    longcruise

    70 Cal.

    Joined:
    Mar 1, 2005
    Messages:
    5,054
    Likes Received:
    214
    Well, specifically the threads for the cleanout screw on a GM drop in barrel.

    I lost mine while doing a barrel refinish and nothing in my treasure chest seems to fit. Any help here appreciated!
     
  2. Jan 13, 2020 #2

    SmokepoleSam

    SmokepoleSam

    SmokepoleSam

    32 Cal.

    Joined:
    Jun 30, 2005
    Messages:
    96
    Likes Received:
    13
    Location:
    Long Island,NY
    I just checked my two Green Mountain barrels and one is 8/32 and the other is10/32 threads. Go to your local hardware store with the barrel and try some screws, or buy a few screws and take them home to try. Your jags and brushes are 8/32 or 10/32 so you could try them also. Good luck
     
  3. Jan 13, 2020 #3

    SDSmlf

    SDSmlf

    SDSmlf

    40 Cal.

    Joined:
    Nov 4, 2006
    Messages:
    1,437
    Likes Received:
    619
    Location:
    Western North Carolina
    FYI, not really a clean out screw, just the plug for the cross drill hole required to connect the nipple hole to the breech. TC actually started drilling from the opposite side of the barrel specifically to stop people from removing the screw and losing it or buggering it up.

    There is is no good reason to remove the screw.
     
    Tom Compton and Britsmoothy like this.
  4. Jan 13, 2020 #4

    longcruise

    longcruise

    longcruise

    70 Cal.

    Joined:
    Mar 1, 2005
    Messages:
    5,054
    Likes Received:
    214
    Yeah but clean out screw is commonly understood and more economical than
    "FYI, not really a clean out screw, just the plug for the cross drill hole required to connect the nipple hole to the breech."

    Actually I had a very good reason for removing it but unfortunately lost it. Thought I'd solve the problem without carrying a gun barrel into the hardware store but that's probably what I'll do in the morning.
     
  5. Jan 13, 2020 #5

    bubba.50

    bubba.50

    bubba.50

    54 Cal.

    Joined:
    Aug 21, 2010
    Messages:
    1,968
    Likes Received:
    179
    As stateed, you can try your cleanin’ jags and take whichever size works to the hardware store. Be easier than totin’ a barrel.
     
    azmntman likes this.
  6. Jan 14, 2020 #6

    longcruise

    longcruise

    longcruise

    70 Cal.

    Joined:
    Mar 1, 2005
    Messages:
    5,054
    Likes Received:
    214
    I had a bunch of screws to play with and determined 10-32. They were all allen heads and I wanted a flat screwdriver head so I picked one up at Ace.

    Interesting observation, the threads have a very slight taper. Probably intentionally done with a through tap. It allows a tight fit with the correct length screw and doesn't allow the screw to go up against the nipple threads. If a too long screw were forced it could jam into the nipple threads.
     
  7. Jan 14, 2020 #7

    SDSmlf

    SDSmlf

    SDSmlf

    40 Cal.

    Joined:
    Nov 4, 2006
    Messages:
    1,437
    Likes Received:
    619
    Location:
    Western North Carolina
    There was an issue reported with some GM barrels having the ‘clean out screw’ going in too deep and causing problems with some nipples. Sounds like you don’t have that issue, but something to be aware of.
     
  8. Jan 16, 2020 #8

    ugly old guy

    ugly old guy

    ugly old guy

    40 Cal

    Joined:
    Feb 18, 2019
    Messages:
    276
    Likes Received:
    120
    Have you asked Green Mountain?
    They should know. They might even have a replacement in stock they'll send you for little or nothing.
     
  9. Jan 16, 2020 #9

    longcruise

    longcruise

    longcruise

    70 Cal.

    Joined:
    Mar 1, 2005
    Messages:
    5,054
    Likes Received:
    214
    Per post #6, problem solved.
     
    SDSmlf likes this.

Draft saved Draft deleted

Share This Page

Group Builder
arrow_white