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Thread: m14 castle nut lock screw

  1. #1
    Boolit Mold
    Join Date
    Jan 2016

    m14 castle nut lock screw

    what is the size of the hex wrench for the lock screw of the castle nut?
    thanks kurt

  2. #2
    Boolit Grand Master

    Larry Gibson's Avatar
    Join Date
    Jul 2005
    Lake Havasu City, Arizona
    Originals were metric.....so a 15mm should fit.

    Sometimes a 1/16 many times fits.
    Larry Gibson

    “Deficient observation is merely a form of ignorance and responsible for the many morbid notions and foolish ideas prevailing.”
    ― Nikola Tesla

  3. #3
    Boolit Mold
    Join Date
    Jan 2016
    thanks for the reply, this is for a norinco rifle with what I think is a US flash hider, took the screw out with the 1/16 wrench ,but not right size, to loose but cant find the right size to put it back correctly.


  4. #4
    Boolit Master
    leebuilder's Avatar
    Join Date
    Dec 2014
    Nova Scotia
    Get a new set screw the one I had was so soft it wouldn't take a retorqueing.
    Can't remember the size, since removed it.
    When you read the fine print you get an education
    when you ignore the fine print you get experience

  5. #5
    Boolit Master
    historicfirearms's Avatar
    Join Date
    Mar 2011
    Petoskey, MI
    My Norinco had a soft set screw as well. I have to baby it taking it in and out. Some day I will have to get a new one
    I was a dog on a short chain
    and now there’s no chain.
    Jim Harrison 1937 -2016

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check