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Thread: Bolt carrier "catching"

  1. #21
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    That's what I figured it was.
    Though honestly I thought the half moon carrier was coupled with a notched hammer.

    Excuse my lack of knowledge but why is that bad per sey? I was always under the influence that letting the BCG (pistol slide too) drop foward without a round in the magazine to chamber it and slow it down is what's bad?
    There is nothing wrong with letting the bolt close with the force of the action spring on an empty chamber.
    AR-15 or pistol.
    How would you do dry fire drills?
    Quote Originally Posted by scottryan View Post
    Anybody that owns or sells pistol versions of assault rifles is a bottom feeder, irregardless of the ban status of certain ammunition.

    They are illigetimate weapons that have no real purpose other than to attract retards to the gun community.

  2. #22
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    Quote Originally Posted by sinlessorrow View Post
    Excuse my lack of knowledge but why is that bad per sey? I was always under the influence that letting the BCG (pistol slide too) drop foward without a round in the magazine to chamber it and slow it down is what's bad?
    It doesn't hurt the AR-15, what happensgenerally when riding the CH is it will not have enough force to strip a round from a magazine, and can sometimes cause other issues with chambering.

    The BCG will slam home even when loaded, it really makes no difference if its loaded or not, just let it fly when you charge it.[/QUOTE]


    I figured as much and i didn't realize people would ride the CH when chambering a round. Thought we were just talking while inspecting it and such. Thanks tho

  3. #23
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    Put a different BCG in the gun and see if it still happens. This can show if the BCG is your problem.

    PB
    "Air Force / Policeman / Fireman / Man of God / Friend of mine / R.I.P. Steve Lamy"

  4. #24
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    The issue is the hammer riding on the bottom of the carrier and impacting the firing pin. A simple look at the top of your hammer showes the wear pattern of the firing pin rubbing where it should be. All wear on the hammer should be on the impact face, not any on the top of the hammer. ((improper wear pattern on hammer noted below)



    I will bet that when you're "riding" your bolt home, you do not have the trigger pulled and held down. If you (make sure the rilfe is unloaded first) pull the trigger, then hold it down and then hand cycle the bolt, you'll find that this problem either doesn't exist or is greatly diminished.

    This is because when the neutered bolt carriers came out, the intent was to prevent people from being able to put in an FA slector so that someone could allow their rifle to "slam fire" (for lack of a better term) their weapon by allowing the hammer to ride forward with the bolt carrier and impact the firing pin upon locking up (thus acting somewhat like a fixed firing pin weapon).

    When the trigger is held back properly, the BCG moves freely, but if the hammer is allowed to ride forward, it impacts and catches on the firing pin, thusly slowing the bolt and the hammer (as well as causing undue stress on the firing pin and the firing pin retaining cotter pin) and doesn't allow enough forward inertia to allow the weapon to "slam fire".

    Technically, there is nothing functionally wrong with your gun as it *should* work fine so long as you're actually shooting it.

    On the other hand, the quality of parts in that thing is ****ing appaling.....
    Last edited by GrumpyM4; 11-28-12 at 20:27.
    It is missing the point to think that the martial art is solely in cutting a man down; it is in killing evil. It is in the strategem of killing the evil of one man and giving life to ten thousand -Yagyu Munemori

  5. #25
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    If the above fix from trying different carrier doesn't work, it could be (being a built AR) that the gas tube is not perfectly centered in the upper. You may need to move the barrel nut left or right a tad to line up the opening better. This was what was happening to a friend of mine and how I had to fix it. From the pics it looks to be stopping almost at the point of impact Key to tube. In the one showing gas tube and key,the tube looks off center(could be from angle of picture), and it looks like a wear mark on one side of the key wear the tube is pushing the key to one side of the CH. Just another thought if a different BCG doesn't change things!

  6. #26
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    Quote Originally Posted by Pappabear View Post
    Put a different BCG in the gun and see if it still happens. This can show if the BCG is your problem.

    PB
    Great idea. I put a non-shrouded semi-auto BCG in there... the problem went away!

    Quote Originally Posted by GrumpyM4 View Post
    The issue is the hammer riding on the bottom of the carrier and impacting the firing pin. A simple look at the top of your hammer showes the wear pattern of the firing pin rubbing where it should be. All wear on the hammer should be on the impact face, not any on the top of the hammer. ((improper wear pattern on hammer noted below)


    I will bet that when you're "riding" your bolt home, you do not have the trigger pulled and held down. If you (make sure the rilfe is unloaded first) pull the trigger, then hold it down and then hand cycle the bolt, you'll find that this problem either doesn't exist or is greatly diminished.

    This is because when the neutered bolt carriers came out, the intent was to prevent people from being able to put in an FA slector so that someone could allow their rifle to "slam fire" (for lack of a better term) their weapon by allowing the hammer to ride forward with the bolt carrier and impact the firing pin upon locking up (thus acting somewhat like a fixed firing pin weapon).

    When the trigger is held back properly, the BCG moves freely, but if the hammer is allowed to ride forward, it impacts and catches on the firing pin, thusly slowing the bolt and the hammer (as well as causing undue stress on the firing pin and the firing pin retaining cotter pin) and doesn't allow enough forward inertia to allow the weapon to "slam fire".

    Technically, there is nothing functionally wrong with your gun as it *should* work fine so long as you're actually shooting it.

    On the other hand, the quality of parts in that thing is ****ing appaling.....
    A very informative and outstanding post. Thanks for that, I learned alot. Closer inspection does reveal unusual wear on the top of the trigger. I did what you mentioned.... with the trigger depressed the issue went away and the BCG no longer "hung."

    I've never had a problem with this gun functioning, but I wanted to make sure there wasnt a catastrophic issue waiting to happen

    Yes, yes I know this gun is a ****ing disaster My primary gun is a DD Mk18, back up is a RRA middy, and lastly, this hunk-o-shit.... but I still want to make sure my hunk-o-shit is still capable of sending rounds down range reliably

    Thanks to everyone for all the help!

  7. #27
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    No worries, mate.
    It is missing the point to think that the martial art is solely in cutting a man down; it is in killing evil. It is in the strategem of killing the evil of one man and giving life to ten thousand -Yagyu Munemori

  8. #28
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    As an extra tidbit of info, you do know that the firing pin shroud comes in two diameters, right? You almost certainly have the large-diameter shroud pin.

    You could also solve the problem by swapping out the large-diameter shroud for a firing pin with the smaller shroud diameter.

  9. #29
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    Yeah... the 16 firing pin is wider. If you put a 16 firing pin in a ramped carrier, you'll jam up the gun good.
    "You people have too much time on your hands." - scottryan

  10. #30
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    Quote Originally Posted by patrick sweeney View Post
    As an extra tidbit of info, you do know that the firing pin shroud comes in two diameters, right? You almost certainly have the large-diameter shroud pin.

    You could also solve the problem by swapping out the large-diameter shroud for a firing pin with the smaller shroud diameter.
    No, i did not know this!

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