Bolt Disassembly / Cleaning Warning

Discussion in '223 / 5.56 MVP and Variants' started by RoyP, Aug 29, 2013.

  1. RoyP Active Member

    Member Since:
    May 9, 2013
    Message Count:
    210
    as much as I love these rifles, I was a little bummed to find that the drop arm spring on my varmint no longer works. I noticed it today when I was cleaning it. I emailed mossberg in hopes that they will just send me a new spring. I really don't want to send the rifle in, I figure the warrantee was void after I installed the tactical bolt knob anyways. If they insist I send it in , I am going to take it apart myself and try to find a spring on my own to fix it. I would rather not pay for shipping and their gunsmith fees to replace it.
  2. Marneaus Moderator

    Member Since:
    Jul 31, 2013
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    477
    What spring is that? The little flap on the bolt?
  3. RoyP Active Member

    Member Since:
    May 9, 2013
    Message Count:
    210
    yes, I got the roll pin out and now I think it might have fell out when I took my bolt apart last week. it looks like it would be a small flat spring steel thing. I expected to find a broken spring but there was nothing there. what it looks like is when the bolt head is off the spring can slip out the back side of the flap where it pivots. I emailed mossberg in hopes they would send me one.
  4. RoyP Active Member

    Member Since:
    May 9, 2013
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    210
    ok I pulled my other bolt apart to see whats missing. you do NOT have to take the flaps roll pin out to change the spring. now here is the kicker
    DO NOT TAKE YOUR BOLT APART UNLESS YOU HAVE TOO. THERE IS A HAIR SIZE SPRING HELD IN PLACE BY A METAL WIRE RING ON THE SHAFT OF THE BOLT HEAD. this is the spring that works the flap. if you do be really careful putting the bolt head back in.
  5. Shaun Member

    Member Since:
    Feb 13, 2013
    Message Count:
    46
    Great, now I'm going to have to take mine apart to see what you're talking about [IMG]

    Seriously though, the bolt disassembly question comes up often enough that we should probably have a sticky with pictures. We could put the gotcha's there.

    Thanks for the heads up.
  6. RoyP Active Member

    Member Since:
    May 9, 2013
    Message Count:
    210
    if I get to chance I'll take mine apart again for pics. the only thing I figure is when I wiped the end of the bolt head I must have wiped the spring right off without knowing it. on the plus side it didn't break.
  7. RoyP Active Member

    Member Since:
    May 9, 2013
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    I looked at the pic of your bolt that you posted apart. posted in the trigger problem post. you can't see the spring but you can see the groove that the ring that holds it in place goes.
  8. Shaun Member

    Member Since:
    Feb 13, 2013
    Message Count:
    46
    Here's the spring detail, sorry for the quality

    IMG_0258.JPG

    It looks like the gotcha is if the gap of the circular retaining spring is over or near the flapper spring. I rolled mine around to the other side after taking the pic and the bolt went back together fine.

    The top of the bolt looks funky in the picture because I used the retaining pin to hold it at an angle for the picture.

    Thanks for the heads up.
  9. RoyP Active Member

    Member Since:
    May 9, 2013
    Message Count:
    210
    excellent, thanks. I must have just wiped mine right off when I cleaned it. I have checked all my cleaning rags but no luck. looks like I'm at the mercy or mossberg at this point. I hoped that I would at least find the ring but no such luck.

    this needs to be stickied with a different title so others know to watch out for this.
  10. MechTech Moderator/ Damn Yankee

    Member Since:
    Aug 7, 2011
    Message Count:
    769
    I will make it sticky. I may finally get some free time this weekend to work on a bolt disassembly pictorial and I will get some better pics and reference to the pitfalls of cleaning the bolt. New title, " Bolt Disassembly/ Cleaning Warning.
  11. MechTech Moderator/ Damn Yankee

    Member Since:
    Aug 7, 2011
    Message Count:
    769
    Big thanks to RoyP and Shaun for keeping us in the loop and problem solving the feed tab spring issue with the bolt head. It appears that the spring retainer may come off the bolt head easily during cleaning and release the feed tab spring, launching the spring into the unknown! Everyone feel free to chime in if you have anything to add. Thanks!
  12. RoyP Active Member

    Member Since:
    May 9, 2013
    Message Count:
    210
    thanks, my eyes are not the greatest anymore and I never noticed the spring.i HADS To take my other bolt apart to compare the two. honestly I didn't expect the spring to be like that to begin with. I thought it was a coil spring in between the head and flap, wrong!
  13. MechTech Moderator/ Damn Yankee

    Member Since:
    Aug 7, 2011
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    I got some good pics of the bolt head assy while I was putting together the bolt disassembly tutorial. I agree with Shaun, it's very possible to rotate retaining ring for the feed tab spring on the shaft of the bolt during cleaning. The gap in the retaining spring is a few millimeters wide, more than enough for the feed tab spring to pop out. I am interested to see if the retaining spring rotates over time with use of the rifle. Even if it did rotate to the opening, it would all still be captured within the bolt assy until it was disassembled for cleaning and might not even affect function.
    [IMG]
    [IMG]
    [IMG]
    Coyote Ugly likes this.
  14. RoyP Active Member

    Member Since:
    May 9, 2013
    Message Count:
    210
    great pics. I headed to my hardware store with the bolt head, when I got out in the bright sunlight and I realized that the retaining ring is still there. It was just rotated so the gap was at the top. the only thing missing is the spring. I purchased the smallest diameter spring they had and made my own.it works like new. I am still waiting to hear from mossberg to see if they will just send me a spring. I would like to have the proper one in there.
  15. wood chucker Moderator

    Member Since:
    Dec 19, 2012
    Message Count:
    1,583
    Thanks for bringing this to our attention.

    I think I will use a fine point punch to stake the bolt in the gap to keep the ring from rotating.
    Barry Hedrick likes this.
  16. MechTech Moderator/ Damn Yankee

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    Great idea wood chucker!
  17. Frank Mc Member

    Member Since:
    Sep 4, 2012
    Message Count:
    50
    I agree with you a 100%. My bolt has never been apart, not quite sure why you have to take it apart. When I clean my rifle I spay the bolt with CLP,wipe it clean and use 3 or 4 drops of Xtreme sports lube on it.Never have had any issue with the rifle. The MVP takes very little lubrication to keep it humming. 4,200 rounds thru it as of this morning and still shooting sub MOA out to 400 yds.
  18. RoyP Active Member

    Member Since:
    May 9, 2013
    Message Count:
    210
    nice! I took it apart because I removed the bluing from the flutes and didn't want any of the bluing remover to get left behind.
  19. Tomas204 New Member

    Member Since:
    Sep 28, 2013
    Message Count:
    1
    I let my 14 YO son take mine down and clean it up ;), that boy is smart
  20. trixter New Member

    Member Since:
    Jan 8, 2014
    Message Count:
    3
    I had a firing pin problem with mine and had to disassemble the bolt to see what was up. Every few shots, the bolt would cock way too light and then when I registered another round and locked the bolt down, i would pull the trigger and the firing pin would jam after moving only 1/16" or less. I would have to cock and try to fire about 10 to 12 times and then slowly it would start firing again. What I found was the firing pin had a very rough exterior, and as it started to go through the Bolt Head Pin, it would catch and not fully extend. I took some OO steel wool and smoothed the firing pin and all is well. I would have sent it in but 'Squeek' season is approaching. Well you know..................

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