Muzzel threads for 94AE 30-30

Discussion in 'Gunsmithing and Repairs' started by milsurpguy, Apr 22, 2021.

?

Threads on 30-30

  1. 7/16-24

    0 vote(s)
    0.0%
  2. .578-28

    2 vote(s)
    100.0%
  1. milsurpguy

    milsurpguy member

    Joined:
    Feb 12, 2021
    Messages:
    551
    I had assumed I could just cut 5/8-24 threads on there, so I measured one of my rifles that has 5/8-24 because I figured it probably wouldn't be precisely 0.625'' nope, 0.620 inches.
    Then I measured my barrel on my 94AE, well it's right about 0.600", well there goes that plan.
    I don't want to cut it down to 1/2-28, I don't want any LH metric BS.
    Looks like my 2 main choices are 9/16-24 (.5625) and possibly 0.578x28, which would be kind of weird.

    But it looks like I'm stuck. I can't find squat in 9/16-24, silencers, thread adapters, quick connects, DIY form 1 materials. I can't find anything that will let me put a .578x28 anything on a 30cal silencer, which kind of makes sense if you think about it.

    I just waited 13 months for an form 4 to go through and don't want to do it again. It doesn't appear I can get a commercially made silencer with 7/16-24 or a thread adapter or quick connect. So form 1 and I can do whatever I want it looks like.
     
  2. LoonWulf
    • Contributing Member

    LoonWulf Contributing Member

    Joined:
    Jul 3, 2010
    Messages:
    14,071
    Location:
    Hawaii
    Maybe talk to @MachIVshooter
     
    Bfh_auto likes this.
  3. Blue68f100

    Blue68f100 Member

    Joined:
    May 25, 2011
    Messages:
    6,728
    Location:
    Piney Woods of East Texas
    Cut what ever threads you can and make an adapter for it to fit your can. In worst case it would add about 1" in length,
     
  4. MachIVshooter

    MachIVshooter Member

    Joined:
    Aug 11, 2005
    Messages:
    17,003
    Location:
    Elbert County, CO
    What's you aversion to 1/2-28? There's nothing wrong with that for .30 cal, it gives you lots of shoulder with a .600" OD, and tons of muzzle device options (just watch the aperture size).

    I wouldn't recommend 1/2-28 on a .30 cal precision rifle due to the slight enlargement of bore it causes, but do it all the time with sporters, lever guns, others that aren't expected/don't need to hold itty bitty groups at range.
     
  5. milsurpguy

    milsurpguy member

    Joined:
    Feb 12, 2021
    Messages:
    551
    It's kind of a precision 30-30, if such a thing exists. With hand loads it shoots about 1 inch at 100 yards on a good day.
     
  6. MachIVshooter

    MachIVshooter Member

    Joined:
    Aug 11, 2005
    Messages:
    17,003
    Location:
    Elbert County, CO
    When I say precision, I mean guns that will hold better than 3/4 MOA at several hundred yards.

    1" @ 100 "on a good day" is acceptable sporter accuracy. You would not notice a difference with the belling, and 9/16-24 wouldn't be any better. To avoid that, we're talking 5/8" threads on .224" cal and 3/4" threads on .30 cal.
     
  7. milsurpguy

    milsurpguy member

    Joined:
    Feb 12, 2021
    Messages:
    551
    I put 1/2-28 threads on my M1 carbine, that metal looks pretty thin. Only about .95 of metal. I figure that's fine for lower power 30 cals like 30carbine, 300 blackout, 30mauser, 30 Luger, ect.
     
  8. MachIVshooter

    MachIVshooter Member

    Joined:
    Aug 11, 2005
    Messages:
    17,003
    Location:
    Elbert County, CO
    Your barrel wall thickness at thread roots and undercut would be about .072". The median minor diameter for 1/2-28 3A is .452"

    I've threaded. 300 win mag sporters 1/2-28.

    You don't have chamber pressures at the muzzle end, you're not gonna banana peel a barrel from the front. The issue is just one of the bore growing slightly (.0005"-.001") which can adversely affect accuracy, but again, not really an issue with guns that need to be hunting accurate as opposed to winning long range shooting matches accurate. I put 5/8-24 threads on my .220 swift because it could support that size and needs to hit prairie dogs out to 800 yards. But I have 1/2-28 on my 7mm-08s and on my sister's .280, they all shoot MOA no problem.

    One should always go with the largest threads a barrel will support, but you still need a shoulder, and to put that on a lever action with threads that are nearly barrel OD means cutting the mag tube back even further. Collars also just don't look very good on a lever gun.
     
    LoonWulf likes this.
  9. milsurpguy

    milsurpguy member

    Joined:
    Feb 12, 2021
    Messages:
    551
    Good point. And that's why I'm not a machinist.
    Ok I didn't know 1/2-28 threads could go on 300 win mag, then they can definitely go on a 30-30.
    I have like 4 inches of no mag tube under the barrel.
    With a 30-30 at even 500 yards all I can do is scare prairie dogs. Shoot have a bullet land near them and they all run back underground. If I did hit one, it wouldn't be the one I was aiming for.
     
    LoonWulf likes this.
  10. milsurpguy

    milsurpguy member

    Joined:
    Feb 12, 2021
    Messages:
    551
    Ok, next problem. It looks like I'm not going to have a front sight.
    It looks like cutting into the barrel to thread I won't have a dove tail for a front sight. The dove tail is only about .6 inches from the muzzle.
    I'm thinking turn the barrel down and slip on an M14 sight or something similar.
     
    LoonWulf likes this.
  11. jmorris

    jmorris Member

    Joined:
    Sep 30, 2005
    Messages:
    17,598
    How are you intending to turn down and thread the muzzle?

    Just do that to a piece of barstock, then do the ID whatever threads you want and thread the barrels OD the same. Not a new idea and often done.

    0589F60B-B1C9-4045-BA94-06AACC1033FD.jpeg

    One thing I have done by hand are dovetails. I take a triangle file and grind one of the faces smooth, so it won’t cut (“safe”) at the proper angle. I then mill the slot to depth and cut the dove tail by hand to fit the sight. The slot could be cut with a file as well.

    6F1F7BDC-20E6-4BFC-B849-106914135DBD.jpeg


    FWIW you might check and see if the sights are going to be tall enough to be usable with the can on. If the can is larger enough in diameter they can’t be seen “over” it, you will be wasting your time as you are going to need something else taller to aim with anyway.
     
    LoonWulf likes this.
  12. milsurpguy

    milsurpguy member

    Joined:
    Feb 12, 2021
    Messages:
    551
    Oh my 30cal silencer is 1.5 inches wide. No irons will clear it.
    Put it te barrel on a lathe, make it the correct size and thread it on the lathe with tail stock die holder most likely.
     
    LoonWulf likes this.
  13. MachIVshooter

    MachIVshooter Member

    Joined:
    Aug 11, 2005
    Messages:
    17,003
    Location:
    Elbert County, CO
    Just put your shoulder 1/16 forward of the dovetail. ~.500 is plenty of tenon. AR tenons are .625" to accommodate a crush washer. I normally put a .550" tenon on centerfire rifles, but sometimes a little shorter in a situation like yours. My Marlin 1893 .25-35 has a .51" tenon to leave enough meat for the sight dovetail to stay solid.

    If you're talking about doing it between centers, it's a gamble. It might work out, but rifle bores tend to be snaky, and the bore axis of the last couple inches that dictate bullet trajectory is seldom the same as a straight line from chamber mouth through muzzle. Might get lucky and only be off a few thou at the front of the can, or you might get baffle/end cap strikes.

    That's why I put them inside the spindle with a 4 jaw and a spider on the back of the spindle to move the axis where it needs to be. I do this with twin dial indicators and a precision turned rod that goes 2" into the bore and hangs 3" out the front.

    IMG_2313.JPG

    IMG_2314.JPG

    If the barrel OD or protrusions from it are too large to fit in the 1.4" Hardinge HCT spindle bore, I use a large cat's head I made on my big lathe:

    20201222_142149.jpg

    I use a fixture I made to compensate for barrel taper and allow that kind of articulation in the jaws while maintaining a rigid set up:

    20210202_082450.jpg

    20210311_132521.jpg

    As for die threading, it can be done, but generally requires a much longer undercut and may not turn out as clean as single point.
     
    Last edited: May 2, 2021
    milsurpguy, Bfh_auto and LoonWulf like this.
  14. milsurpguy

    milsurpguy member

    Joined:
    Feb 12, 2021
    Messages:
    551
    How much to do a 24 inch 94AE barrel?
    Just the barrel, already removed, super easy.
     
  15. MachIVshooter

    MachIVshooter Member

    Joined:
    Aug 11, 2005
    Messages:
    17,003
    Location:
    Elbert County, CO
    Threading of a loose, stripped 94 barrel is $60 + shipping
     
    milsurpguy likes this.
  16. milsurpguy

    milsurpguy member

    Joined:
    Feb 12, 2021
    Messages:
    551
    That sounds good.
     
    Last edited: May 22, 2021
  17. milsurpguy

    milsurpguy member

    Joined:
    Feb 12, 2021
    Messages:
    551
    Deal, where do I send it and should I just shove $60 in the box with the bbl?
     
  18. MachIVshooter

    MachIVshooter Member

    Joined:
    Aug 11, 2005
    Messages:
    17,003
    Location:
    Elbert County, CO
    No, never a good plan to send cash, and you'd have to know return shipping to do that.

    Best thing from here is to send an email or Facebook message. Jerrica handles our communications and service queues, and she does not monitor bulletin boards.

    [email protected], Facebook.com/ECCOMachine
     
  19. milsurpguy

    milsurpguy member

    Joined:
    Feb 12, 2021
    Messages:
    551
    Ok I'll do that
     
  20. milsurpguy

    milsurpguy member

    Joined:
    Feb 12, 2021
    Messages:
    551
    Yeah you are the next state over so that will work pretty good.
     
  21. brickeyee

    brickeyee Member

    Joined:
    Feb 25, 2005
    Messages:
    3,160
    Standard V-threads are supposed to be flat topped by a few thousandths 0.620 vs 0.625 sounds about right.
    No purpose is served by NOT flat topping the threads.

    It avoids galling problems on the weakest part of a v-thread.
    That very fine top of the thread.
     
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice