Increasing leade on 9mm AR barrel

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  • ken792

    Ultimate Member
    Sep 2, 2011
    4,490
    Fairfax, VA
    Not sure what your asking, educate me.

    The area where the rifling gradually starts. He wants it increased, either to reduce pressure or chamber longer bullets.

    http://bisonballistics.com/articles/an-introduction-to-rifle-chambers

    chamber-neck-diagram@2x.png
     

    clandestine

    AR-15 Savant
    Oct 13, 2008
    37,032
    Elkton, MD
    I have a 5.56 Throat reamer, no 9mm reamer though.

    Unless you have someone local, a Gunsmith is going to charge:

    -Disassemble and Reassemble AR Upper ($20.00-$75.00 depending on the Smith and the Rail System)
    -Return Shipping & Insurance ($20-$40)
    -Reaming ($35-$50 per Barrel)

    At a minimum, you are looking at $90.00 locally and if not local its at least $110.00 for both guns unless you want to buy a reamer and do it yourself.
     

    DutchV

    Ultimate Member
    Jul 8, 2012
    4,730
    If you're feeling handy, buy the reamer, do the job, then sell the reamer as "lightly used".
     

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