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Thread: 158 carpenter steel bolt list

  1. #1
    Gunco Addicted for life j427x's Avatar
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    Postak 158 carpenter steel bolt list

    a short list of bolts made from mil-spec steel.

    colt 158 MPI

    DD 158 MPI

    LMT 158 MPI

    SABER 158 MPI

    Bravo company USA 158/mpi

    CMT 158 and other brand names that use CMT products like stag & RR some are MPI some not.

    bushmaster 158

    DPMS 158


    older DPMS. olympic and bushmaster may have been 8620 in the past-- i can't so far confirm this??

    some of the UBER-tanium bolts use 9310 steel and have some improvements including thicker web portions and so on. some my have a nitrogen type coatings. expect to shell out a $100 bill for one.

    it might be a shorter list to find the makers of the softer 8620 bolts?

    anybody want to add to the list?

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    White Cracker 4thIDvet's Avatar
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    Question

    What the hell is mil spec steel j4. Do I need those now?
    Damn ARs. I knew I should have never become a "Mall Ninja."
    5:30 in the morning and you got me in my room taking my ARs apart too see if they are mil spec steel.
    Almost filed bankruptcy with the AKs. Now these ARs will put me in debtors prison for sure.
    "Man needs but two things to survive alone in the woods. A blow up female doll and his trusty old AK-47" - Thomas Jefferson 1781


  3. #3
    Gunco Addicted for life j427x's Avatar
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    Postak

    Quote Originally Posted by 4thIDvet View Post
    What the hell is mil spec steel j4. Do I need those now?
    Damn ARs. I knew I should have never become a "Mall Ninja."
    5:30 in the morning and you got me in my room taking my ARs apart too see if they are mil spec steel.
    Almost filed bankruptcy with the AKs. Now these ARs will put me in debtors prison for sure.

    #158 carpenter steel is the military spec material for the bolts.

    most bolts are made from this steel even the cheap ones as far as i can tell.

    on the mall-ninja sites they go on an on about 158 steel and MPI inspection.

    such and such brand name is better cause it is 158 they say.

    well i got to checking and it looks like most bolts made in the past few years are 158 steel!

    the odds of getting a 158 steel bolt are higher than getting commercial grade 8620 steel even if your buying off the shelf stuff.


    since i have never had a 8620 bolt (unless the m1 sales 7.62x39 is 8620 and it probably is)

    i can't comment on how well they last. i figure being soft they will wear out quicker. still should last a couple thousand rounds anyway.

    it ain't something i lose any sleep over in 5.56 that is for sure--LOL

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