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  1. Past hour
  2. survivalshop

    Zero headspace is perfect

    Just saying HS is measured from the Bolt Face to the SAAMI Shoulder datum point is enough . The fitment of the Barrels Extension is Critical for proper Function & HS .Sketch is a little crude , but shows it's just not as easy to adj. HS by trimming the Barrels Extension . The relationship of all the Action components are critical , as has been said , it's a domino effect , if you start changing the dimensions/spec's of one of them.
  3. Today
  4. 308kiwi

    Zero headspace is perfect

    To clarify what I said "head space in an AR system is measured between the front face of the barrel extension lugs and the datum point of the shoulder area of the chamber" This obviously includes the bolt, which is a fixed component that you cannot, (should not) alter.
  5. 98Z5V

    Zero headspace is perfect

    This needs to be reviewed - Kiwi is giving the proper information on headspace.
  6. Cunuckgaucho

    Pic Of The Day 2

    Too funny Doc
  7. Alan Waters

    Zero headspace is perfect

    Ok,
  8. 98Z5V

    Zero headspace is perfect

    On a bolt gun.
  9. 98Z5V

    Zero headspace is perfect

    Then quit trying the stubborn-machinist argument on it, sating your idea will work, then defending it... and listen to what's being given to you. You have any idea how many precision AR barrels Kiwi has made from scratch and bar stock, in New Zealand, for customers? You should re-read, and listen to what he's trying to tell you. Shiit, I can't make an AR barrel for anything - but I know the steps it takes to make one. Even I can see that what you're describing will not work. You can't afford to set a BCG body back int he upper at all. Nothing. Nada. You fuk with that, and you just fucked up the whole operation of the gun. Then you're compensating for the next fuk-up, machining something else... Listen, man, listen.
  10. Robocop1051

    Bug Out Backpack

    I always thought Icon was on the verge of Tactical. They were always close just for the “style” of it.
  11. Alan Waters

    Zero headspace is perfect

    Well, the whole conversion is not about how headspace is measured. It's about how to reduce the distance between the bolt face and the rear of the cartridge which is headspace.
  12. Matt.Cross

    Zero headspace is perfect

    I can see Alan's point, assuming a gas port hasn't been drilled yet. I think part of the explanation is semantics. It's a lot harder to clearly describe the issue than it is to simply visualize.
  13. Alan Waters

    Zero headspace is perfect

    No doubt about that. Its a steep learning curve for me.
  14. 98Z5V

    Zero headspace is perfect

    Work the buddy-angle, and get him hooked, too - I love it...
  15. 98Z5V

    Zero headspace is perfect

    OKay - think what you want. Good luck with it. You'll find that there are MANY second and third order effects of what you're describing.
  16. 308kiwi

    Zero headspace is perfect

    I have a very good friend who owns an engineering supply shop, I will get him on the case tomorrow
  17. Alan Waters

    Zero headspace is perfect

    We are only talking about a .009 setback. Should not affect the BCG.
  18. 98Z5V

    Zero headspace is perfect

    The barrel flange, brother. That would have to get cut to do what he's trying. Which is only going to change everything rearward - which is alot - ALOT - of parts that are not on a bolt gun.
  19. 308kiwi

    Zero headspace is perfect

    Sorry dude but head space in an AR system is measured between the front face of the barrel extension lugs and the datum point of the shoulder area of the chamber, end of story. You can shift the barrel/barrel extension assembly wherever you want but it will not change this relationship.
  20. Matt.Cross

    Zero headspace is perfect

    Flange is what threw me at first too, I believe he's referring to the face on the muzzle end of the barrel extension.
  21. 98Z5V

    Zero headspace is perfect

    No problem - you might need the quart bottle, over that little 2-ouncer, though, with what you go through over there...
  22. 308kiwi

    Zero headspace is perfect

    Thanks 98
  23. 308kiwi

    Zero headspace is perfect

    Alan suggested removing material from the rear of the barrel extension shoulder or the front of the receiver face, either would shift the entire assembly rearward. But yes absolutely, Fit the barrel extension, cut the chamber to head space THEN drill the gas port😀
  24. 98Z5V

    Zero headspace is perfect

    How are you going to accomplish that on an AR platform, and keep the BCG and recoil system in check?... You set that back, and you set the BCG back. As soon as you do that, you set the cam pin back - and it MUST rotate in the upper receiver cam pin cutout... There's alot more here than there is in a bolt gun...
  25. 98Z5V

    Zero headspace is perfect

    Use Rock-Sett, brother. Never worry about it again. This is the manufacturer - Flexbar: http://www.flexbar.com/shop/pc/ROCKSETT-2-OZ-p4019.htm I found that spec, years ago, in a military manual reference. The 'net is so polluted with information now, that finding it is a fruitless waste of time. I will find it again, someday, and save the shiit out of it when I do. And post it here with an immediate request that it be pinned...
  26. Alan Waters

    Zero headspace is perfect

    I'm not measuring the headspace between the the barrel extension and the chamber. That is not headspace. If you set the barrel/extension back it locates the chamber closer to the bolt face.
  27. Matt.Cross

    Zero headspace is perfect

    Well, forward in the sense of heading towards the muzzle and potentially leaving the BCG riding farther forward. The shoulder on the barrel extension is theoretically still resting on the receiver face. Otherwise, completely agree with your assessment. Simplest solution seems to be to wait until correct headspace is established and then drill the gas port. 👍
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