Making The MVP Stupid Accurate

Discussion in 'Gunsmithing' started by X Ring Accuracy, Apr 23, 2014.

  1. X Ring Accuracy Member

    Member Since:
    Apr 13, 2014
    Message Count:
    60
    Had some time to go over an MVP owned by Rob Lynch. Here are some of things we have done so far.
    During disassembly we didn't need the proper spanner wrench for the barrel nut as we will be fitting a new barrel soon that will not use the nut. That's why the pipe wrench marks are on the barrel nut. For swapping out prethreaded barrels we will do a write up on that next.
    Here are all of the components apart and cleaned:
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    Here is some pics of the action. Note, very little bolt lug contact on the internal lugs.
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    To start, we had to make a mandrel to fit the action for set up in the truing process.
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    Once we got the mandrel made, off to the lathe. Dialing in the mandrel so the action now runs perfectly concentric with its bore.
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    Mandrel removed, ready to cut. We will cut the face square as well as the internal lugs.
    [IMG]
    The action face required .002 removal to get true and the internal lugs was a total of .003. .001 off of 1 lug and .003 off of the other.
    [IMG]
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    You can see now everything is square and true. Once all of the surfaces have been trued in the action it's time to move onto the bolt head.
    In the process I forgot to take pics of the bolt head in the lathe (sorry) but here is the trued bolt head.
    [IMG]
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    Surprisingly, the face of the bolt where the cartridge meets it was dead flat so we didn't need to remove any metal there. The barrel is to be delivered in a few days so we will continue this thread when we chamber it.
    Upcoming we will also show how we tuned the factory trigger. Happy Shooting
  2. robert lynch CrossHair Precision Industry Partner

    Member Since:
    Feb 11, 2014
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    looking real good man. I can not wait to get it back so I can make some bug holes with it. I got some 80.2 and 90 gr Berger's on there way.
    Hey do you want me 2 load some proof rounds up? I told Mike Bacon we are truing it up and he was so excited.


    Rob
    mbacon likes this.
  3. ZBob New Member

    Member Since:
    Oct 25, 2012
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    Oh man. You guys are getting me excited. I have been thinking about this for a while. I am really interested in hearing your results. Any chance this could be service offered to fellow MVP forum members? ;)
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  4. robert lynch CrossHair Precision Industry Partner

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    ZBob, it will be yes. Its one of things I wanted to do from day one. :)
  5. X Ring Accuracy Member

    Member Since:
    Apr 13, 2014
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    We will be offering this service and be providing the MVP forum members a discount. Stay tuned for updates to this thread.
    wood chucker and Zagmp like this.
  6. mvpredator_noah Member

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    Apr 8, 2014
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    Do you thread barrels?
    mbacon likes this.
  7. robert lynch CrossHair Precision Industry Partner

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    Feb 11, 2014
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    Mvpredator, for a muzzle break or flash hider?
  8. NBK Member

    Member Since:
    Sep 24, 2013
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    That's awesome guys!!!! I'd be very interested in this service. I'd also be interested in having the muzzle threaded (if that's something your doing as well) for suppressor use.
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  9. robert lynch CrossHair Precision Industry Partner

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    Feb 11, 2014
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    I will let X Ring chime on the suppressor, but the last 2 338's he built for me had breaks on them. I know he threaded those for sure.

    Rob
  10. mbacon CrossHair Precision Industry Partner

    Member Since:
    Mar 16, 2014
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    Watching X Ring do his thing is like watching a master artist painting a canvas! These improvements are going to be SWEEEEET!!! I can't wait to see the finished product.
  11. mvpredator_noah Member

    Member Since:
    Apr 8, 2014
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    Well for a flash hider, but do supressors use the same threads? Eventually I am going to do suppressor on mine but that won't be for a while. A flash hider would be perfect untill then
  12. wood chucker Moderator

    Member Since:
    Dec 19, 2012
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    Yes they do.
    The important thing when threading for a can is that the threads be cut dead concentric with axis of the bore.
    This needs to be done with a cutter on a lathe. Teeny tiny bit crooked can = bullet striking the baffles. Tap and dies sets just will not do here.
    bonehedz likes this.
  13. X Ring Accuracy Member

    Member Since:
    Apr 13, 2014
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    We can thread your muzzle as well as a new barrel when needed. As wood chucker said, its got to be dialied in concentric and cut on a lathe. Alot of flash hiders and muzzle brakes share the same threading so a swap in the future is easy. We suggest to determine what suppressor you will be using in the future, get the thread pattern and then match the brake or flash hider to it. During the threading of your barrel we will also cut a target crown to help squeeze more accuracy from it.
  14. MechTech Moderator/ Damn Yankee

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    I like where this is headed! Thanks X-Ring!:D
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  15. X Ring Accuracy Member

    Member Since:
    Apr 13, 2014
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    Thanks Mech. Like any other gun/rifle made in a production scenario. We can make them better : )
  16. Kent New Member

    Member Since:
    Apr 24, 2014
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    While your at it, could you tell me what the diameter and pitch of the barrel tenon threads are?
  17. X Ring Accuracy Member

    Member Since:
    Apr 13, 2014
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    This one is .870 X 28
  18. Kent New Member

    Member Since:
    Apr 24, 2014
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    15
    'Love your work, and here I thought most accuracy gunsmiths went extinct in Florida. However, now I'm really confused about the barrel threads. Let me explain.

    I have a MVP Varmint that I want to re-barrel, but I need to know the barrel thread specs before I commence. I've heard and read several specs, all different, most speculation:

    -"It's the same as a Savage." (1.055"x20tpi)
    -1.00"x20tpi
    -1.16"x??tpi; My MVP barrel just ahead of the installed barrel nut.
    -.870"x28tpi; Yours

    Savage threads would be very convenient as I have several pre-threaded Savage barrels , including the one I want to install. I could use a Savage barrel nut, too, another convenience.

    HELP! I've asked Mossberg Tech Support three times, too, and got zero answers. They are a dead end.
  19. ARKLITE881South Member

    Member Since:
    Jan 22, 2014
    Message Count:
    37
    Maybe its time we start complaining about the Mossberg Tech support directly to Mossberg upper echelon. . Support is that, help, support,problem solving, etc. We need to be, or get, persistent on the questions that people ask.And, if not satisfied with the answers, ask for a supervisor, or other person above the one your talking too. If you don't get the answers/help, then i guess its time to go elsewhere to buy a different brand of rifle. After all WE, the one's who buy the firearms from them, ARE paying their wages.
    jason.hayes3 likes this.
  20. 80hp New Member

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    Nov 16, 2012
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