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Thread: FA FCG in SA lower

  1. #11
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    I did in fact conduct testing on this matter and have video showing a 30 round mag dump in under 4 seconds.

    Quote Originally Posted by GTifosi View Post
    Removing the disconnector tail prevents that by allowing it to engage regardless of selector being in semi or auto postion.

    I do contest the 'firing like a machinegun' part though.
    Countless people have removed thier SA disconnector, which creates the same outcome as sear removal; a free flying hammer, in an effort to achive just that effect and found they were wasting thier time and effort.

    Certainly primers have much to do with it, as do a few other things but in general the odds are pretty slim that a slamfire FA will be created.

    Kids: don't try it at home.
    Its illegal unless one has certain special licences and conditions and will net you some time with bubba the butt humper if you don't.



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  2. #12
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    I didn't say impossible, I said pretty slim odds.

    Nor do I contest that you accomplished it. (in fact I'd go so far as to say I'd be more surprised if you hadn't)
    I contest that its nowhere near as easy as it sounds.

    Most folks don't have access to a supressor and home rolled cartridges which can skew results. (PMC Bronze notwithstanding)

    Tweaking springs and carrier weight can help too though that is not something most folks have a lot of laying around to optimize with.

    Again, definitely not impossible, but odds of failure are significantly higher than odds of success.

    If it were really that easy there'd be a great many more people out there who got *busted for removing thier disconnect, grinding the hammer engagement hook, or even just tying it back with a bread tie to make a bullet hose.

    *Because you know there's a pile of dumbasses who have to try it at least once.
    On a public range.
    In front of people.
    With a camera and youtube vid to show off with

    Last edited by GTifosi; 04-10-12 at 12:02.

  3. #13
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    Quote Originally Posted by Iraqgunz View Post
    I did some testing on this subject and was able to successfully fire several 30 round magazines on full auto. The suppressor seemed to assist in facilitating it.

    I believe some of the ammo was PMC Bronze Line and some handloads.
    I bet that probably did help. Wonder if the increased carrier speed allowed the hammer to lag behind it enough to make it work? Or does the increased speed only happen on the rearward stroke?

  4. #14
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    you could always Mod the parts to semi cut the hammer tab and the disconnector would it not run semi only then with No hang ups.
    a Bubba Home gunsmith/dealer did this in the 80's and early 90's that I knew .
    he could get FA parts cheaper with surplus purchases he did .He would file the hammers and Disconnectors .

    although I believe he did use semi selector switches ,I do Know the ATF came down on him for some other things he was doing with unregistered RDIAS (he was making them) .But lucky for you the ATF does not factor in on this .


    NRA Member

  5. #15
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    Quote Originally Posted by QuietShootr View Post
    I bet that probably did help. Wonder if the increased carrier speed allowed the hammer to lag behind it enough to make it work? Or does the increased speed only happen on the rearward stroke?
    Faster movement rearward should give more buffer spring compression as it tries to slow, stop, and reverse direction of the BCG.

    More compression/stored energy pushing the BCG forward should mean more velocity too.

    At least as I grasp it anyway.

  6. #16
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    Quote Originally Posted by GTifosi View Post
    Faster movement rearward should give more buffer spring compression as it tries to slow, stop, and reverse direction of the BCG.

    More compression/stored energy pushing the BCG forward should mean more velocity too.

    At least as I grasp it anyway.
    I could see that, or I could see that since the length of the stroke is the same, the compression velocity doesn't matter. Is there a physicist in the house?

  7. #17
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    Physics

    Since someone asked regarding the Potential Energy stored in a spring.
    This website explains it pretty clearly. It'd be harder to type the formulas.

    http://theory.uwinnipeg.ca/physics/work/node5.html

    To answer your question. If the spring compresses the same distance, then no. Potential Energy stored in the spring is the same no matter how fast it was compressed.
    But if the bcg is travelling faster, it'll most likely compress the spring more than if the bcg were travelling slower.
    Although, if the spring is already compressed to the max, then the original statement holds true.
    Hope I wasn't too confusing in my explanation.

  8. #18
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    Potential rebound of the buffer if it bottoms in the receiver extension and how hard as a result of carrier speed may play into too.

    Way overthinking it by now, ain't we...

  9. #19
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    Without an auto sear in place if you tried to shoot with the selector on Auto, wouldn't the weapon fire the entire magazine even if you took your finger off the trigger?

  10. #20
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    No.
    The released trigger would catch and stop the hammer.

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