M16 Bolt Carrier

M16 Bolt Carrier
Dimensional correct, taken from Colt M16 Bolt Carrier.
Models are tested and proven, ready for CNC.
Models also available in STEP/IGS file format as well as original SolidWorks Source Files.


  • Bryant R Stone

    I am checking you and your site out good sir… so far I like what I see. Keep up the good work

    • http://www.youtube.com/SSIDesigner Nathan F.

      Glad you like it, we hope to publish some more work and tutorial soon. Thanks for your words

  • Pablo

    Nathan, for your BC, for the gas key threads, you use THRU 10-32 UNF-3B, but just wondering if many in the industry still use that size, or have gone to 8-32? As we cut some BC, but we had to turn out some modified 10-32 cap screws with smaller heads and opened up the gas keys for the larger thread pitch to be able to use off the shelf gas keys. Just wondering if many folks would even appreciat, 10-32, or better to use 8-32.

    • http://www.youtube.com/SSIDesigner Nathan F.

      Pablo: Very good question, “most” in the industry have gone to 8-32, however Colt and FN (to my knowledge) still use 10-32 as that’s the standard.

  • Joshua Miles

    Great work Nathan, Ive been actually trying to find some prints or 3d models on forge parts itself before they are milled out, do you have those for 308 and ar15,

    • http://www.youtube.com/SSIDesigner Nathan F.

      Joshua: I haven’t published any forged as billet is what’s most requested (lower upper) for both the Bolt Carrier and Bolt they either start as an steel rod, or extruded but not forged.

      • Joshua Miles

        my bad, I was actually refering to the lower and upper of the ar15 and ar10…the reson why i want to create a fixture for the forge before the lower and upper are milled to spec.

  • Eric Hinds

    Nathan, can I get all your files available for your bolt carrier?

  • Smith

    Great job. Could you please email the STEP/IGS files? Thanks

  • MidGasFan

    Nathan, I realize I came to this a few months late, but could you please email me the STEP/IGS files? Pretty please? We’re going to attempt a few carriers out of 7075-T6 and 7068 or 7099 for a dedicated uber lightweight rifle. Any help would be greatly appreciated!

  • Hayden Skeens

    I’m in the same boat as midgasfan i need the STEP/IGS files if at all posible

  • matt

    Could you please email me the IGES for the bolt and carrier? Thank you so much

    • http://www.youtube.com/SSIDesigner Nathan F.

      Matthew: e-mail sent.

  • John

    Can you please email the native solidworks file for this and the bolt?

    • http://www.youtube.com/SSIDesigner Nathan F.

      John: e-mail sent.

  • Tucker Ward

    Nathan, I realize I came to this a few months late, but could you please email me the STEP/IGS files? Triggerdaddy@yahoo.com

    • http://www.youtube.com/SSIDesigner Nathan F.

      Tucker: e-mail sent.

  • john dough

    Might you send me the STEP file? Muchas gracias.

    • http://www.youtube.com/SSIDesigner Nathan F.

      John: e-mail sent.

  • Michael B Hernandez

    Might you send me the STEP file? Thanks.

  • Steve

    Do you have any files of the ar-15 Trigger group or know where I could find them? Im trying to put together an entire AR assembly. Thanks

    • http://www.youtube.com/SSIDesigner Nathan F.

      Steve:
      Yeah I got it but haven’t got the time to make them publilc. Just too busy

  • Allen

    Can you send me the .stp and solidworks file. Much appreciated, thanks

    • http://www.youtube.com/SSIDesigner Nathan F.

      Allen: e-mail sent.

  • bj

    could you clarify a dimension for me?
    whats the total length of the cam slot? its supposed to be .325 but that’s before the 22.5 deg rotation while cutting it yes? I ask because the prints have the distance from the front hole axis to the front of the carrier which is .640 but they don’t have the distance from the front of the carrier to the rear hole axis and I must be doing it wrong because the bolt when assembled isn’t forward enough inside the carrier and doesn’t lock into the barrel extension.

    • http://www.youtube.com/SSIDesigner Nathan F.

      BJ: The Cam Slot is the most annoying part from the Bolt Carrier and the most important. About the distance, it START on .640″ from the front face, then you keep the angle at 0º for 0.042″ and then you start the rotational cutting until you reach 22.5º at .255″ from the START, then keep cutting on the 22.5º for the remaining 0.070″ the tolerance for those dimensions are +-.002″.
      Hope I made it more clear.

      • bj

        Thanks a lot mate.

        • http://www.youtube.com/SSIDesigner Nathan F.

          You are welcome