NEED HELP! Major malfunction

Discussion in 'AR-15 Discussion' started by BigRedUSMC, Sep 7, 2013.

  1. BigRedUSMC

    BigRedUSMC New Member

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    Hey forum,
    I just added a quad rail and my light from deployment to my personal AR15 and when I began to check it I found a huge problem (well huge to me) and I have no clue what's wrong. I just got out of the marines today and moved back home to VA so it's not like I can have one of my armorer buddies come look at it for me. When I lock my bolt to the rear it seems like it's moving forward (it is) and that felt wrong to me. So I decided to try and insert a magazine to see if it'll still feed properly (it won't). The problem is is that the bolt locks to the rear with the catch manually engaged while sliding the bolt to the rear but has to slide forward to "catch" and it causes the front of the bolt to sit so far forward that the tip of the bolt sits on top of the rounds when I inset a new magazine. So now when I slap the bolt release to send it home and load a round it just slides over the rounds or jams. I really need some help here guys.

    image-601615740.jpg

    1. Bolt manually pulled all the way to the rear
    2. The next is where the bolt is catching with the bolt catch
    3. With mag inserted you can see the bolt is on top of the back of the rounds
    4. Another view of the improper bolt placement
     

    Attached Files:

    Last edited: Sep 8, 2013
  2. ZombieBrawler

    ZombieBrawler New Member

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    .....what?
     

  3. deadsp0t

    deadsp0t New Member

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    Lolololololololol
     
  4. BigRedUSMC

    BigRedUSMC New Member

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    Premature post it's fully up now my bad
     
  5. c3shooter

    c3shooter Administrator Staff Member

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    OK- couple of things to check.

    Yes, your bolt IS going too far forward. Why?

    Is any part of the rail interfering with the bolt catch lever? Remove upper, turn so you can look in, latch bolt to rear, push with thumb- and what is slipping? Is the bolt catch dinged up on the inside?

    And do check that bolt/ Bolt carrier group is properly assembled.
     
  6. ZombieBrawler

    ZombieBrawler New Member

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    I thought i just needed another beer...
     
  7. Jpyle

    Jpyle New Member

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    The bolt on the AR will not lock open without an empty mag in the magwell. When there are rounds in the mag it should slide past the rim in order to strip a round out of the mag. Try inserting an empty mag and locking the bolt back with the charging handle. If the bolt hangs that far back with an empty mag then the problem may be in the stock, there is nothing that far back other than the hammer for the bolt to catch on...have you changed buffer springs? Is there a carbine length spring in a rifle length tube? Something else the rear of the bolt carrier is hanging up on?
     
  8. BigRedUSMC

    BigRedUSMC New Member

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    Everything internally is factory original. I haven't even shot it but twice so far. I had it at the range two weeks ago and it functioned great I just don't know where this is coming from. It's probably my bolt catch. It does the same thing with an empty mag
     
  9. Jpyle

    Jpyle New Member

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    Sounds like it. Does the bolt look ok? No missing teeth or anything? Is the bolt catch under tension, can you feel the spring tighten up? Do you remember "dropping the hammer" on the bolt catch with the upper removed?

    Lot of questions I know.

    BTW, welcome home and thanks for your service.
     
  10. robocop10mm

    robocop10mm Lifetime Supporting Member Lifetime Supporter

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    Remove the upper and post some pics inside the upper and lower. Could be a broken bolt stop. Easy to break if you snap the hammer while the halves are separate.
     
  11. BigRedUSMC

    BigRedUSMC New Member

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    Ill take some pics of the interior tonight so you all can see what's going on. That you all who are helping me out
     
  12. BigRedUSMC

    BigRedUSMC New Member

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    The bolt catch works properly with an empty magazine so it has to e something wrong with the bolt.

    Could my buffer be broken? I feel like that should be pushed in all the way
     

    Attached Files:

    Last edited: Sep 8, 2013
  13. BigRedUSMC

    BigRedUSMC New Member

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    Hammered it in that far and it works now. I'm ordering a new buffer because even tho this works it's really messed up so if anyone has a link for a new one I'd appreciate it!
     

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  14. JonM

    JonM Moderator

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    that buffer is definately broken.

    your gun is new contact S&W for a new buffer should be under warranty
     
  15. BigRedUSMC

    BigRedUSMC New Member

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    Is it normal for the firing pin to mark my primer like this when chambering a round???

    I don't recall my M16 doing this once
     

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  16. purehavoc

    purehavoc New Member

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    Take the rubber back out and get the holes lined up get the rubber wet and then drive it back in. Put a new roll pin in it . Looks like S&W just forgot to put the roll pin in it
    If there isnt any holes in the rubber run a drill bit from hole to hole and pin it
     
  17. rferguson61

    rferguson61 New Member

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    I'm not an expert on the AR platform...but it shouldn't do that. The pin find touch the primer until you pull the trigger. Check to see if the firing pin is stuck/broken. Clean/lube it. If you leave it like that you are heading down a scary and dangerous road to a negligent discharge...
     
  18. sbeezy

    sbeezy New Member

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    That looks like it could have been close to hitting the primer hard enough to fire the round. I wouldn't chamber another round until that's figured out or you're at a range/somewhere safe to shoot. Sounds like you got unlucky on this one. Not that it's anything that can't be fixed most likely, but it sucks that you have to fix a new gun.
     
  19. rferguson61

    rferguson61 New Member

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    I agree with sbeezy...but with it being said that it's new...take it back...get one that isn't full of malfunctions.
     
  20. BigRedUSMC

    BigRedUSMC New Member

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    Apparently is a normal thing that happens when chambering most every AR15. It's called a Light Primer Strike and is cause by the floating firing pin. If most of you go chamber a few rounds and eject them you should see the same thing