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Thread: Trigger wont reset!

  1. #11
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    gotm4, I want to thank you again for the help. I got the disconnector in the mail yesterday and put it in last night. It seems to have a much smoother finish than the one I had, and moves more freely inside the trigger. Anyway, the trigger resets now when cocking by hand. I'll take it to the range tomorrow and see how she does. Thanks again!

  2. #12
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    Quote Originally Posted by Stan9106 View Post
    gotm4, I want to thank you again for the help. I got the disconnector in the mail yesterday and put it in last night. It seems to have a much smoother finish than the one I had, and moves more freely inside the trigger. Anyway, the trigger resets now when cocking by hand. I'll take it to the range tomorrow and see how she does. Thanks again!
    Glad it worked out for you. If it's resetting by hand I'm 99% sure it will on the range too. IIRC I sent you a LMT disconnector.
    Chief Armorer for Elite Shooting Sports in Manassas VA
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  3. #13
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    Question

    I know this is an old post, but I'm having similar problems with a new upper. I recently purchased an AR57 upper and put it on my Bushmaster lower (with a single stage trigger) that I've had for about 8 years (without any major issues). I took it to the range to zero it and it would load fine, eject fine, but after the first shot it would strip a round out of the magazine and seat it in the chamber, but it would not reset the trigger. I contacted the manufacturer and they suggested I try another lower and a standard buffer (the AR57 uses a proprietary buffer). I then tried the upper on my LMT lower (with 2 stage trigger) with the same results, first shot goes bang and is ejected, second round is chambered, but no trigger reset. After this I sent the upper back to AR57 so they could look at it. They test fired about 200 rounds on 4 different lowers and it worked flawlessly every time. At this point everyone involved is extremely baffled, anyone here have any thoughts?!?



    Mods, if you feel this deserves it's own thread feel free to move it.

  4. #14
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    I believe that I would go with the disconnector or disconnector spring. Sounds like it, but internet surgery is a guessing game sometimes.

    Quote Originally Posted by Boomer10 View Post
    I know this is an old post, but I'm having similar problems with a new upper. I recently purchased an AR57 upper and put it on my Bushmaster lower (with a single stage trigger) that I've had for about 8 years (without any major issues). I took it to the range to zero it and it would load fine, eject fine, but after the first shot it would strip a round out of the magazine and seat it in the chamber, but it would not reset the trigger. I contacted the manufacturer and they suggested I try another lower and a standard buffer (the AR57 uses a proprietary buffer). I then tried the upper on my LMT lower (with 2 stage trigger) with the same results, first shot goes bang and is ejected, second round is chambered, but no trigger reset. After this I sent the upper back to AR57 so they could look at it. They test fired about 200 rounds on 4 different lowers and it worked flawlessly every time. At this point everyone involved is extremely baffled, anyone here have any thoughts?!?



    Mods, if you feel this deserves it's own thread feel free to move it.



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  5. #15
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    I ended up getting a new upper to replace the first one (again, the guys at AR57 were very easy to deal with). I also picked up a new disconnector and spring but haven't had a chance to drop them into the lower. I took the new upper to the range today to test it out and I've come home with a different issue (which is making me think it's the lower, not the upper). I fired the first shot and it loaded the next round like the previous upper and it reset the trigger so I was starting to get my hopes up until I actually fired the second round. At that point it fired 4 rounds.

    Nothing was changed in the lower while the upper went back to the manufacturer and the new upper came in the exact same format (16" barrel, proprietary carbine buffer, etc.) and now it wants to fire in bursts. I can either return it to the dealer I bought it from (and sell the mags & ammo) or I can see if the new parts for the lower solve the problem.

  6. #16
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    I have AR57 uppers and at 1st I had the wrong buffer in it.Make sure the buffer is the right lenght for your stock is correct

  7. #17
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    Looks like they sell a couple of buffers. You never said if you have a collapsible butt stock or a rifle butt stock?

    AR57-CAR "Carbine" Buffer (230g 3.5") designed for "Carbine" / "Retractable" / "Collapsible" Stock lower receivers.

    AR57 - A2 Buffer (233.5g 6") designed for standard "A2 type" / "Butt" / "Rifle" Stock lower receivers.
    The buffers listed on AR57 site are pretty heavy (>8 oz.)
    Last edited by CryingWolf; 03-09-09 at 08:45.

  8. #18
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    Yes, I've already confirmed with the manufacturer that I have the correct buffer. They even had me try the first upper with a standard carbine buffer to see if that would help. It didn't so I'm on upper number 2 with issues as well.

    Unfortunately this is going back to the dealer as I'm tired of dealing with it.

  9. #19
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    Thumbs up

    I'm a new guy here but I've had this problim before.
    It sounds like a disconector problem.
    Is your disconector spring good?
    Is it properly in place?This is the first thing I would check.

    Is the nose of the disconector itself in good shape...corners nice and square and fairley sharp?
    Is the sharp hook on the under side of your hammer in good shape ,no burrs or chips missing?If this area is damaged it may cause the hammer to follow the bolt carrier home and with soft primers (not common with military 7.62x39) slam fire and double or run Full auto it may also cause out of battery fireing which aint cool.
    Hope this helps somebody.

  10. #20
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    Quote Originally Posted by dragonguard View Post
    I'm a new guy here but I've had this problim before.
    It sounds like a disconector problem.
    Is your disconector spring good?
    Is it properly in place?This is the first thing I would check.

    Is the nose of the disconector itself in good shape...corners nice and square and fairley sharp?
    Is the sharp hook on the under side of your hammer in good shape ,no burrs or chips missing?If this area is damaged it may cause the hammer to follow the bolt carrier home and with soft primers (not common with military 7.62x39) slam fire and double or run Full auto it may also cause out of battery fireing which aint cool.
    Hope this helps somebody.
    The disconnector and disconnector spring are both good and were checked out by a local gunsmith (who is very familiar with the AR platform).

    This upper uses 5.7x28mm, not 7.62x39. Not sure if you were posting that for me or for somebody else.

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