MVP related mechanical drawings

Discussion in 'Modifications' started by sharky47, Nov 13, 2012.

  1. sharky47 Active Member

    Member Since:
    Nov 1, 2012
    Message Count:
    162
    EDIT - Added a screenshot HD-009 Screenshot.jpg

    I am going to use this thread to post mechanical drawings/reference material that I find/generate that pertains to the Mossberg MVP or modifications to it. Anything I post here will be either generated by myself, or posted with permission.

    Mods - if having a section of the forum dedicated to archiving technical information is useful - feel free to move this thread. Figured I'd start here and see where it goes.

    I am a big believer in open source information - we know that using the state and it's violent mechanisms to control information does not work. With this in mind, my goal is to make all the information I generate free to the public. I may from time to time decide not to release something, but it will be up to me to protect it - I will not go whining to the legal system if I lose control of my information. I have benefited time and time again from the generosity of folks out there on the internet sharing information. I can tell you that almost all of my gunsmithing abilities were formed by reading until I was blue in the face online - combining my own changes, and then manifesting physical objects in this 3D world we inhabit. Information wants to be free - and in the end, there is nothing anyone can do to stop it.....

    So, off my soapbox!

    Credit for translating my hand drawn prints into nice, professional drawings goes directly to my brother. I do plan on hosting these drawings on my website as soon as I have time to upload them. I currently have a drawing for a PKM ammo box bracket, which is useful for anyone else out there building a semi-PKM out of those PKT kits that Apex has/had.

    First up is a drawing of the factory barrel jam nut. This may be useful in re-creating a part that may be unavailable - or a basis for modification.

    Attached Files:

    Denny L, glocker21 and Dust like this.
  2. dcompton New Member

    Member Since:
    Jun 21, 2012
    Message Count:
    21
    Sharky,
    I find this very interesting. I was surprised to see a shoulder on the barrel at the end of the tenon. I was thinking like a Savage where the major thread diameter is the same as the barrel diameter at the receiver. Looking at the print for the nut, it looks as though you thread the nut onto the barrel and the nut is counter-bored to allow for the nut to run up over the larger diameter of the barrel. Am I on the right track? Just trying to visualize how my barrel swap is going to go. I'm sure it will all make more sense once I pull the old barrel off, but I like to formulate a plan in my head.
    The CAD looks great. It will help a ton while turning my 300 barrel. Thanks for the open source. Karma will get your back one day.

    DC
  3. sharky47 Active Member

    Member Since:
    Nov 1, 2012
    Message Count:
    162
    Yes, the nut does extend over the barrel - I'll have the drawing of the tennon up today one way or the other. I believe they did this to allow you to set the headspace and lock the nut down, but still have it extend over the barrel for a nice appearance.

    Karma gets back to me everyday - and that's not some silly hippy talk - I really do mean it.
  4. sharky47 Active Member

    Member Since:
    Nov 1, 2012
    Message Count:
    162
    HD-010 Screenshot.jpg As promised - Barrel tennon print.

    Attached Files:

    joe77, glocker21 and Dust like this.
  5. Eric Fisher New Member

    Member Since:
    Nov 15, 2012
    Message Count:
    2
    Happy to help out. If anyone has any legible napkin sketches with measurements obtained with at least a 3 place caliper/mic of other parts of this weapon system, and is willing to host them here, I don't mind making more 3d models/2d drawings.
  6. MechTech Moderator/ Damn Yankee

    Member Since:
    Aug 7, 2011
    Message Count:
    769
    Welcome to MossbergMVP.com Eric! Really appreciate you offering your tallents. I have made more than a few napkin sketches over the years, but they needed an interpreter more than a machinist. Do you have a Mossberg MVP ?
  7. Eric Fisher New Member

    Member Since:
    Nov 15, 2012
    Message Count:
    2
    No, not yet. I sold my AR-15 this last summer. I would like to build something new before the new year. I am thinking a MVP in Blackout on the unibody aluminum chassis Sharky is working on.
  8. dcompton New Member

    Member Since:
    Jun 21, 2012
    Message Count:
    21
    mods, can we get a sticky on this thread?
    I cannot wait to see Sharky's chassis.
  9. MechTech Moderator/ Damn Yankee

    Member Since:
    Aug 7, 2011
    Message Count:
    769
    Sticky Done! I have talked with Sharky47 about how we can categorize and present all the specs, drawings and info he and other MVP members are posting. At this rate we may end up creating sub forums.
  10. sharky47 Active Member

    Member Since:
    Nov 1, 2012
    Message Count:
    162
    Here's the first draft of the barrel nut wrench.

    Keep in mind that I have not made one of these yet - which means they are 100% untested - so use this information at your own risk.

    I have a water jet guy quoting this part and I do plan on making a run of these to sell.....BUT.....you are more than welcome to make your own. HD-011 Screenshot.jpg

    Attached Files:

    joe77 and glocker21 like this.
  11. MechTech Moderator/ Damn Yankee

    Member Since:
    Aug 7, 2011
    Message Count:
    769
    Nice job Sharky47! Looks like you are keeping your brother busy. Just let me know where the line starts to get a barrel wrench. I wanna build an MVP in 300BLK with a 12" barrel. That should keep it under 40" OAL with suppressor. Would really kick ass with that chassis your creating!
  12. sharky47 Active Member

    Member Since:
    Nov 1, 2012
    Message Count:
    162
    Oh yeah, if there wasn't a bribe/groveling required to exercise the 2am in the "land of the free"......all of my BLK stuff would be between 8-12". Seems to be the most logical choice base on physical performance of this cartridge.

    A 12" integrally suppressed barrel would be the bees knees for sure!
  13. wood chucker Moderator

    Member Since:
    Dec 19, 2012
    Message Count:
    1,605
    A 12" barrel with a permanently attached can puts it over the 16" minimum and needs only 1 tax stamp or Form 1 ;)
  14. sharky47 Active Member

    Member Since:
    Nov 1, 2012
    Message Count:
    162
    Yup, nothing wrong with a one-stamp gun, but it does make testing new sub loads a little more risky.

    Hey guys, the extractor detent is simply a 1/8 (.125) sphere, basically one ball out of a ball bearing. Also, there is nothing retaining the detent, spring, or extractor itself besides the detent.

    Ask me how I know.

    But I did find it and if anyone needs a replacement, you don't need to bother with Mossberg.
  15. sharky47 Active Member

    Member Since:
    Nov 1, 2012
    Message Count:
    162
  16. wood chucker Moderator

    Member Since:
    Dec 19, 2012
    Message Count:
    1,605
    I'll take a couple.

    Don't ask me why I need them.
  17. wood chucker Moderator

    Member Since:
    Dec 19, 2012
    Message Count:
    1,605
    I mic'd the action and trigger screws and here's what I found.

    Front action screw:
    Socket head cap screw 1/4-28 x .930 Black oxide finish

    Rear action screw:
    Socket head cap screw 1/4-28 x 1.5 Black oxide finish

    Trigger unit mounting screw:
    Flat head ( counter sunk ) Philips #8-32 x 5/8

    Notes; action screws lengths measurements are thread length only and do not include the screw head.
    Trigger assembly mounting screw measurement is overall length and includes the screw head.

    Front action screw engages the front receiver ring to a depth of .100 on my rifle. The hole is .162 deep


    The point of all this is that these are standard Yankee fine thread fasteners available at most hardware stores and certainly get-able from any fastener supply house should the need ever arise.
    The front action screw is a OEM custom length of .930 and not available on the open market. A 1" screw ground to length would do quite well.
  18. glocker21 New Member

    Member Since:
    Jan 2, 2013
    Message Count:
    23

    Excellent info Sharkey47
    joe77 likes this.
  19. donbob New Member

    Member Since:
    Mar 22, 2013
    Message Count:
    1
    Sharky - I'm new to the MVP and this forum. Have you documented the magazine box by chance? I am thinking about making an aluminum version that will take up some of the slop and release the mag better. I've already made a new pin that makes the release better, but there's lots of room for improvement over the injection molded "box". I have access to a good industrial designer, programmer and CNC.

    Thanks!
  20. MassiveD New Member

    Member Since:
    Sep 18, 2014
    Message Count:
    1
    Sharky, do you have a diagram for the stacked nuts you use for the fixed switch barrel application, the one where the barrels retain their reference between hand tightenings? Or even an overall stack height you have found works?

Share This Page