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Thread Protector Caps/muzzle break

Discussion in 'Mossberg 4x4 Bolt Action' started by helmutschlitz, Sep 15, 2013.

  1. helmutschlitz

    helmutschlitz Copper BB

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    2
    I need a thread protector cap for my ATV 30.06. I want to remove my muzzle break and can't find any caps online. Anyone know where I can find one?
  2. LAZY EYED SNIPER

    LAZY EYED SNIPER Overwatch Staff Member Global Moderator Supporter "Philanthropist"

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    21,109
  3. helmutschlitz

    helmutschlitz Copper BB

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    2
    I made a mistake, its' actually by 4x4 but it may have the same thread size. I don't know the thread size yet because they glued the muzzle break on so well I can't remove it. Scouring posts for advice on getting it off without damaging the barrel. thanks for the link.
  4. LAZY EYED SNIPER

    LAZY EYED SNIPER Overwatch Staff Member Global Moderator Supporter "Philanthropist"

    Messages:
    21,109
    Only thing I would suggest is to secure the barrel in a padded vise and apply heat to the muzzle brake. If Mossberg used a locking compound on the threads the heat should help loosen the bond...
  5. rjpoog1989

    rjpoog1989 20g

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    824
    Mine won't come off either, however, I agree with LES. Apply a small amount of heat to the break and it should melt the locktite or whatever they used.
  6. gyotar

    gyotar .22LR

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    14
    I put two allen keys through the holes in the brake then slid a car jack handle over the exposed ends of the allen keys. Used the car jack handle as a breaker bar and it came off easily. You just need some leverage.
  7. gyotar

    gyotar .22LR

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    14
    5/8"OD - 1/2"x28tpi RH
    Smooth
    1/2" Long
    Without Set Screw
    Black Matte Finish

    The only issue is that the black matte finish is a shade off the bluing. Not really noticeable though. The seller had a blue finish but I don't think that would have been much closer.
  8. John A.

    John A. I'm "THAT" guy Staff Member Global Moderator Moderator

    Messages:
    15,018
    Those are two different sizes.

    And very unlikely that it would be 1/2-28. That would be very thin wall (barrel) at the muzzle.
  9. gyotar

    gyotar .22LR

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    14
    I don't care what your opinion is. That's what I ordered for my 30-06 4x4 and it fits perfectly. You think I just made up the numbers? Try learning to read written dimensions.
  10. John A.

    John A. I'm "THAT" guy Staff Member Global Moderator Moderator

    Messages:
    15,018
    helmutschlitz, I emailed Mossberg directly and asked what the thread pitch is for the 30-06 4x4 to eliminate any further confusion or misidentification. If/when they respond, I will paste it to the topic.


    gyotar, completely without getting into specifics about major and minor diameters associated with barrel threading, 1/2 and 5/8 are two entirely different diameters. That's exactly what I said.

    You're disputing that?

    Try threading a 5/8 inch nut onto a 1/2 inch bolt.

    Or even yet, try threading a 1/2 inch nut onto a 5/8 inch bolt.

    Not going to happen.

    If Mossberg used an oddball 1/2-28 thread pitch on a 30 caliber bore, while physically possible to do, would not make very good sense. Industry standards dictate otherwise for that caliber.

    It would be much easier for them to thread the barrel to industry standards so they can simply purchase a 30 caliber flash hider or muzzlebrake over the counter rather than have to perform extra machining to an AR15 flashider to get it to work safely on the gun.

    1/2-28 muzzle devices (AR15) available for purchase will be too tightly constricted in the bore for a 30 caliber bullet to safely pass through. They're made for .223 and are only marginally overbored.

    Don't believe me? If you did happen to thread an off the shelf AR15 (1/2-28) flash hider onto a 30-06, I will all but guarantee that you'll wish that you hadn't as soon as you pull the trigger.

    While I am at it, I'm perfectly capable of reading dimensions, thanks. Try learning how to determine and write them.
  11. RichardPryor

    RichardPryor .410

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    40
    I don't see where he said that 5/8" was the dimension of the threads. If he'd said 1/2" minor and 5/8" major for the threads, that would be way out there. It was pretty obvious to me that 5/8" was the outside diameter of the brake/cap and the threads on the barrel are 1/2" and 28tpi pitch.

    I do agree that Mossberg should have used a 5/8" thread for the brake, but they didn't. I'm quite sure it was easier for them to just have a bunch of 1/2" thread brakes made with the larger center hole than to order a heavier profile barrel to accomodate the larger threads which are normally used for larger than .22 caliber guns.
  12. John A.

    John A. I'm "THAT" guy Staff Member Global Moderator Moderator

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    15,018
    Just to go on record, I received a reply today from a mossberg rep concerning the thread pitch.






  13. Itsricmo

    Itsricmo .30-06

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    Really? 3/4-16??

    Couldn't make it easy could they... is that even a regularly, commercially, available size?? haha
  14. John A.

    John A. I'm "THAT" guy Staff Member Global Moderator Moderator

    Messages:
    15,018
    Nope. First time I have ever heard of it.

    3/4-10 thread was pretty common back in the day for Mac-11's.

    But I have never heard of 3/4-16 barrel thread pitch, nor have I heard of 3/4-10 on anything besides an M11 either.
  15. Itsricmo

    Itsricmo .30-06

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    4,127
    huh.. I didn't think it was common.
    Kind of glad mine isn't threaded... I bet it is a horrible PITA to find a muzzle brake for that pitch
  16. DangerousDan

    DangerousDan .410

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    79
    Hope This Helps I have been a Gunsmith for 40 Years and I bought a Mossberg 7.62X39 barrel and that bad boy was threaded 1/2 x 28 I had to look twice When I seen it DD
  17. John A.

    John A. I'm "THAT" guy Staff Member Global Moderator Moderator

    Messages:
    15,018
    I have an AK that was threaded 1/2-28 also, though it wasn't a Mossberg barrel. It was supposed to have been manufactured by steyr, and cold hammer forged and chrome lined to boot.
  18. Itsricmo

    Itsricmo .30-06

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    4,127
    Whoa... say this again... Mossberg 7.62x39??? Does this go onto the 4x4 action??
    Or did you buy a x39 barrel and thread it for the 4x4 action? Being a gunsmith you have a vast amount experience I wish I had lol
  19. ccrfs

    ccrfs Copper BB

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    3
    does all the new 4x4 come with a muzzle brake?
  20. RichardPryor

    RichardPryor .410

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    40
    There's no way it's a 3/4-16 thread. The barrel simply isn't large enough diameter at the muzzle to support that. It's not quite big enough for 5/8-24. I'm pretty sure all the Mossberg 4x4 brakes, no matter what caliber, are 1/2-28 thread.

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