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Thread: a plastic/nylon 80% lower?

  1. #11
    Gunco Regular dcholl's Avatar
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    I think somewhere in the forum, this was discussed on using 3-D printers for making your own gun parts and lowers....Doc

  2. #12
    No Hope For Me Coils's Avatar
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    Yes there's a few threads about the 3D printers, but the plastics available for them right now hasn't held up to more then a few rounds.

    I think if someone can figure out a cheap way to make a home injection molder would work, the plastics that will hold up for these is easy to get but it comes in pellet or ball form.
    Maybe a wood mold will work since your most likely only going to make a few for yourself, and metal pieces can be added to a few important areas.
    The hard part is making the injector part, it needs to heat up enough plastic to fill the entire mold in one shot.
    "Government is not the solution to our problem, government is the problem" Ronald Reagan

  3. #13
    Gunco Regular Rocster's Avatar
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    The DefenseDistributed guys with the 3d printed AR lower just made some good progress...their latest prototype did 600+ rounds with no failure with one extruded type, and a failure with a second one using a second different printing method..
    The have pics & a video here:
    Defense Distributed blog

    They used a different ABS blend for the material and have added extra beef in areas where Ver. 1, 2 failed.
    Last edited by Rocster; 03-01-2013 at 11:08 PM.
    "To invent, you need a good imagination and a pile of junk."
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  4. #14
    No Hope For Me Coils's Avatar
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    That's good to hear, I think when better plastics become available for these style printers you'll see alot better results.
    "Government is not the solution to our problem, government is the problem" Ronald Reagan

  5. #15
    aka: SDK1968 dutigaf's Avatar
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    say what you mean & mean what you say


  6. #16
    GuncoHolic Sprat's Avatar
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    saw this today if its going to help you decided if you want to go to plastic

    80 % TACTICAL MACHINING LOWER 556 223 AR15 : AR15 Parts at GunBroker.com
    Sprat and sprat1 are one and the same.

  7. #17
    Gunco Regular Rocster's Avatar
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    Hey Coils,
    There is a way to do non-injected, pourable molding too. It is a bit tricky for a complicated part like an AR lower but with care and the right techniques you could get something in urethane that if the right durometer blend could be firm enough for a lower.

    This article is extremely detailed, in fact the most I have ever seen for a molding tutorial...I think you will find it amazing:
    Guerrilla guide to CNC machining, mold making, and resin casting
    "To invent, you need a good imagination and a pile of junk."
    - Thomas Alva Edison
    |> Military training/history DVDs: www.loose-cannon.com/military
    Latest eBook: Build Your Own AK: Vol. II

  8. #18
    No Hope For Me Coils's Avatar
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    Thanks for the link, there's a lot on there and I'll have to look it over when I got more time.

    I know about pourable molding but I don't know how well it will work for something like an AR receiver. Maybe if you can make it with less detail? More like a slab side rather then having all those raised ribs for the small pins and springs.
    "Government is not the solution to our problem, government is the problem" Ronald Reagan

  9. #19
    Gunco Addicted for life j427x's Avatar
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    i looking for a "low tech" solution here--

    its got to be something you can do in a cave--LOL!

  10. #20
    aka: SDK1968 dutigaf's Avatar
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    J,

    BUllets bolt together alum ones are definitely "caveable"..
    say what you mean & mean what you say


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