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Threading a barrel

Discussion in 'NFA Weapon Discussion' started by MacBookProAR, May 25, 2009.

  1. MacBookProAR

    MacBookProAR Stayton Member

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    Just curious before I take this down to my barrel threader what anybody's thoughts are on this one.

    I have a 30-06 that I want to thread for my can that is awaiting paperwork. The barrel is exactly 9/16 thick where it needs to be threaded. My question is this since I'm not familiar with doing the actual threading. Is 9/16 x 24 even possible on this barrel if it is already just 9/16 thick?

    Again, I haven't taken it to someone and plan too I'm just looking for some general direction before doing so as today is a holiday.
     
  2. mxitman

    mxitman N. Seattle Member

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    No expert here but generally when cutting threads you need the barrel at least 1/16" larger than actual finished size but maybe it will work.
     
  3. Keane

    Keane Hillsboro, OR Active Member

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    Well, it depends, the suppressor /whatever would have to index on the muzzle, not a shoulder.

    I have a Cz-75, which has a .502-d barrel, which is cut for 1/2-28. It can cut the threads, but not have a viable shoulder.

    I THINK that the 1/2 (or 9/16") is actually a measurement of the OUTSIDE of the threads, not the inside, so it can be threaded. talk to Mike @Tornado Technologies, he is the best one in the country to ask about this stuff.
     
  4. torpedoman

    torpedoman land of corrupt politicians Member

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    the INDEX ON THE BORE IS THE MOST CRITICAL THING> failure to do this will result in bullet strikes and a ruined can.
     
  5. Keane

    Keane Hillsboro, OR Active Member

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    Baffle strikes, but yes. I figure if he is going to a reputable threading shop, they will be able to properly index it.

    An interesting point brought up though: If your bore is not properly centered currently, you will not be able to have the threads cut.
     
  6. mgd

    mgd Milwaukie,OR Member

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    The major diameter(outside diameter) of a 9/16 threaded shaft is 9/16. As was said earlier, you cannot have a shoulder to but against. I am not a gunsmith, but I am a toolmaker.

    Good luck!:thumbup:
     
  7. terrylf72

    terrylf72 Portland, Oregon, United States Member

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    Here is an idea.. Instead of having your weapon threaded have it set-up like a Knight Armament can, with the 2 locking pins; (push button release) or maybe a 3 barring retention system; just a couple other ways you might look into..

    http://www.knightarmco.com/mk_11_suppressor.html

    Terry
     
  8. MacBookProAR

    MacBookProAR Stayton Member

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    I've emailed with a few and hopefully will get an expert answer soon (not that I don't appreciate your guys' help). I hadn't thought about the bore not being lined up with the OD and that would pose a problem.

    I figured as much, but had to ask since what I'm hearing is that 1/2 x 28 makes to thin of a barrel wall on the end of the barrel, but then again it is going to have a flash hider on it all the time threaded tight so I would think that would make it just as strong as original if not better.

    Good thought, but I'm pretty sure doing that will cost more than I want to pay to suppress this one gun, and Knights probably has that system patented and won't want to let me use it to mount my YHM can! :D

    Thanks all for your help I will let you know as I get closer to having the work done what I find out.
     
  9. krawl

    krawl Oregon Member

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    Probably the simplest solution- find a heavy barrel for your gun. If the barrel is already 9/16 other option i've seen is threading barrel smaller, then making an adapter that would give you a shoulder to mount against.
     
  10. MacBookProAR

    MacBookProAR Stayton Member

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    Yeah I tried to go the thread smaller route and use an adapter but do far have been met with oposition to threading a 30-06 smaller than 9/16 in the first place. I haven't totally given up yet though and hopefully someone will have a solution for me besides getting a different barrel.
     
  11. Keane

    Keane Hillsboro, OR Active Member

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    Ya, common threads for a 30 cal is 5/8x24 or so, so 9/16 is already going smaller than he most likely should.
     
  12. MacBookProAR

    MacBookProAR Stayton Member

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    I had a smith here in town call up YHM and they said that threading 1/2 x 28 and using their .223 adapter in 1/2 x 28 bored out to 30 cal is totally doable and what they suggested doing, but now I'm not sure that I want to run the risk on this gun or just wait to build something in 30 cal with using this suppressor in mind. 300 Win Mag Anyone?