Malfunctioning Bushmaster

Discussion in 'AR-15 Discussion' started by erikthebald, Mar 3, 2011.

  1. erikthebald

    erikthebald New Member

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    One of my shooting buddies has a Bushmaster XM15-E2S that every now and then will light off two. We can't tell if it's the trigger and I myself don't have a lot of experience with this particular weapon. Clearly. it can't be used as it is.

    Does anyone know if this is a common issue with this particular model

    I field stripped is completely this past weekend and see no evidence of any worn parts or battered edges to any of the internal components.

    Should it just be looked over by someone more knowledgeable than myself as my gunsmithing skills are the high end of amateur at best.

    Thanks in advance.
     
  2. c3shooter

    c3shooter Administrator Staff Member

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    Dear Eric: The Bushmaster needs to go to a professional smith ASAP. What you have just descibed is good for 10 yrs in the Federal pokey, AND a fine of up to $250,000. What you just descibed is an unregistered machine gun. Due to floating firing pin design, there are sometimes issues with soft primers being lit by firing pin scooting forward- but I would run from this like a cat running from a police dog convention.

    If you think my reaction is unduly cautionary, I HAVE seen the inside of some of the Federal Penitentiaries, and the Feds HAVE arrested, convicted, and imprisoned people with malfunctioning firearms. On a 1-5 scale of bad situations, you are about at a 17.5 right now.
     

  3. Jpyle

    Jpyle New Member

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    You gotten between a rock and a hard place here since the NFA defines even a malfunctioning semi-auto as a machine gun if a single trigger pull results in multiple discharges. I would suggest, after ruling out operator error, getting it repaired immediately.

    By operator error I mean allowing the trigger to be reset and then pressed during recoil by the shooter...sort of an unintentional bump fire.
     
  4. Sniper03

    Sniper03 Supporting Member Supporter

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    Erik,

    Have you ever installed a trigger in the AR-15?
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  5. Samples.32

    Samples.32 New Member

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    Go see a gunsmith. Most likely it is just bump firing and a heavier trigger will fix the problem. If not than something is out of spec. Good luck.
     
  6. mjkeat

    mjkeat New Member

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    Call BM and see what they say.
     
  7. Sniper03

    Sniper03 Supporting Member Supporter

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    Normally this is an easy fix. But still waiting on Erik to respond as to his knowledge of the rifle.

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  8. VitSports6

    VitSports6 New Member

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    He has been scared off... :eek:
     
  9. wraith

    wraith New Member

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    What you're describing could be caused by "slamfire" (due to binding of the firing pin in the bolt). I've run into this commonly with SKS's; occasionally with AK's and once with an M1A. Though I've heard that true slamfire can cause multiple discharges in an AR, I've never actually seen it. I'd be more concerned about problems in the fire controll system (FCS). Just the same, before you start tearing your lower apart it might be a good idea to be sure that's where the problem is.

    Recommend the following.....
    1.) Swap out the bolt.
    2.) If the gun functions OK you've isolated the problem to the bolt.
    - Pull the pin examine it closely for buurs or other defects that might
    impede it's movement in the channel.
    - Clean the channel well (blow it out with an air hose if you've got one).
    - If the problem persists consider replacing the pin.
    - If the problem persists consider replacing the bolt itself.
    3.) If the problem is not remedied with the bolt swap you've got issues down
    in fire control.
    - Worn or defective disconnector (the most common cause cause)
    - Worn or defective hammer or trigger.
    - The problem you describe can also reslt from a loose fitting FCS
    (especially when due to a worn trigger pin hole) or sloppy upper/lower
    reciever interface.

    If the gun appears reasonably tight, I'd swap out the disconector AND hammer as a cheap first step. If you're not comfortable servicing these parts I'd get a qualified smithy to take a look.

    Don't feel too bad. I've never cared much for Bushies. Thier QC leaves a lot to be desired. I've seen too many problems in freind's guns and the one I did have I eventally ended up replacing the bolt and trigger group before I got it to where I needed it.

    Good luck and be careful. The ATF atrocities cited on this thread are not just urban legend.
     
  10. Sniper03

    Sniper03 Supporting Member Supporter

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    Ok,

    If he was scared off I will tell you the easy fix! I was going to find out if he knew how to remove the Trigger Assembly. Troubleshooting this problem: If it is only happening periodically the fix is simple! Replace the Disconnector Spring and be sure you insert the large end into the Trigger. It should snap into position and stay. I have repaired a hundred or more of them by doing this simple replacement!

    03
     
  11. Gatekeeper

    Gatekeeper New Member

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    I had a double once on my DPMS. I am 99% sure it was the sensitive Federal SR primers I used for that batch of reloads. Rifle was clean, no worn or broken parts, and it only had @800 rounds through it.
    Floating firing pin set off the primer during cycling as near as I can tell.
    Switched primers (CCI) and never had a repeat occurrence.
     
  12. erikthebald

    erikthebald New Member

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    I've never done an AR trigger. In any case, erring on the side od caution, I called my buddy and adfvised him to take it to a qualified gunsmith. No sense tempting fate. I would not be comfortable working on something then taking it down to the public range to see if it was still popping off.
     
  13. Jpyle

    Jpyle New Member

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    Sensible thing to do if you are not comfortable...now you have to step up and build your own, that will boost your confidence...:) Good luck, let us know how it all works out.
     
  14. erikthebald

    erikthebald New Member

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    Yeah, all it takes is one off duty sherrif having a bad day. It'd be different if it was my rifle. And yes, you're absolutely correct, I do need a project. Unfortuinately, I've got a couple other things on the list closer to the top.