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But gun control will work!

Defdist has figured out 3D printed AR-15 lowers. They’ve done magazines before.

11 Responses to “But gun control will work!”

  1. Kristophr Says:

    You need to print the butt-stock and extension tube as part of the lower. This deals with breakage probs at the extension tube hole.

    Cav-arms did this by molding two halves, and friction welding them together.

  2. Tirno Says:

    Kristophr, you could probably get away with not printing a who buttstock if you instead printed some form of combined buffer tube and multiposition structure on the end of the receiver that a separate adjustable buttstock could be added. It wouldn’t take a standard buttstock, but are we or are we not printing out parts?

    The complicated part is how to retain the detent pin and spring that is usually held in by the rear plate, which is held on by the castle nut on the buffer tube. How does Cavarms handle that?

  3. LiquidFlorian Says:

    This is a great development. Lowers are more expensive then I can afford at the moment.

  4. Bryan S. Says:

    That lower will be about the same price… if not more from the printer and material cost.

  5. LiquidFlorian Says:

    Not if I already have access to a printer. 🙂 It would just be cost of the material then…

  6. Alien Says:

    Have either CavArms or DefDist tackled CNC work on raw lowers? Since a raw lower is not a gun, it seems a natural to software the CNC solution and rent someone’s Bridgeport for a couple of hours.

  7. aerodawg Says:

    @tirno Instead of depending on the end plate, drill and tap a hole and use a small allen head set screw. Should work just fine…

  8. Kristophr Says:

    Tirno: Cav arms retains the detent with a long small diameter roll-pin going through the one piece lower-stock. Simple.

    Once it is in there, you just leave it in there, unless something breaks.

  9. Kristophr Says:

    Making the entire lower with the handgrip and buttstock already attached would solve a bunch of breakage issues with plastic lowers.

    Just make a left and right half, and bolt them together.

  10. wizardpc Says:


    That would be a much larger piece than most 3D printers can handle.

    And by “most” I mean “the ones under $20,000.”

  11. Kristophr Says:

    The price will come down. Bet on it.