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Which 80% AR build drill bits are needed?

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  • gotshotgun?
    Veteran Member
    • Jan 2009
    • 3667

    Which 80% AR build drill bits are needed?

    I know the answer to this easy question is somewhere right in front of me. Unfortunately, I am blind. After searching both here and here via Google, I'm here for a quick answer.

    I'm entering the world of DIY 80% builds. I have the know how, I just want a definitive list of drill bits and end mill bits that I will need to complete the receiver. I have a drill press and a tactical machining gen 2 jig. Unfortunately TM doesn't post instructions on their site.

    Please, a quick list of the right sized bits.

    Thanks guys! I'm excited to get into these projects. They are the next new things for me in the firearms hobby.

    Best,

    gotshotgun?
  • #2
    gotshotgun?
    Veteran Member
    • Jan 2009
    • 3667

    Thanks much.

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    • #3
      skyhanger00
      Member
      • Sep 2013
      • 145

      Originally posted by Obstreperous
      The first Sticky at the top has the prints, but to answer your question the selector is .375 (3/8) drill and the other 2 holes are .156 (5/32).
      The pocket I'm not sure what they use I used a Bridgeport and no jig.
      Good luck
      I recently got a mini mill, but don't feel brave enough to mill without a jig to hold my hands. Being a noob machinist here, what are the minimum steps you take before you feel brave enough to trust your mill to mill accurately?

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      • #4
        FML1982
        Senior Member
        CGN Contributor
        • Oct 2012
        • 529



        1 ea. 0.484" Cobalt Drill
        1 ea. 0.375" Cobalt Drill
        1 ea. 0.156" Cobalt Drill
        2 ea. 0.125" Cobalt Drill
        1 ea. 3/8" Carbide Endmill
        1 ea. 1/4" Carbide Endmill

        the above bits are for that jig so some could may not be needed, but the main ones are there for safety selector, hammer/trigger pins, and such.

        For the end mills it is my understanding to use 2 flute mills since the aluminum will want to come out in bigger pieces and clog a 4 flute bit but I am no machinists. ENCO is a good place to order from, they ship quickly and are in Nevada so you get you items within 2-3 days.
        "They show us what's missing in our lives, and how to love ourselves more completely and unconditionally. They connect us back to who we are, and to the purpose of why we are here."-Trisha McCagh when speaking about animals.

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        • #5
          Combat Jump
          Junior Member
          • Sep 2010
          • 14

          I just ordered the AR-15 jig from JTactical, complete with drill bits/end mills. I know its not the cheapest route, but like that the package includes everything.
          Dillon XL650

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