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Thread: KNS Anti Rotation Pins....Is it a fluke or is there something technical behind it.

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    KNS Anti Rotation Pins....Is it a fluke or is there something technical behind it.

    I used KNS pins on my first build before I had any knowledge and before I knew they were unnecessary and serve no practical purpose. They are pretty much like throwing $30 down the drain. I never messed around with uninstalling them because they were the updated version with the stronger pins so I knew they wouldn't hurt anything. On this first build, I used an ALG QMS trigger for reference.


    Fast forward to last week. I was working on my 3rd build and decided to use another ALG QMS since I was happy with the first. I used the stock pins that came with it and everything functioned completely fine. What I noticed was that it had a little bit of creep. Just a tiny bit but it was still noticeable. I wouldn't have thought anything about it except that the first QMS I installed had absolutely no creep whatsoever. I decided to remove it and install it again just for good measure. I got the same results.

    I then began to think if the KNS pins had anything to do with it or if I just got really lucky with the first trigger. I wanted to find out so I decided to use my $30 Amazon credit on some KNS pins.

    I got around to installing them last night and to my surprise, the creep went away. It felt exactly like my first ALG trigger.

    So here's the question. Was this just a coincidence or is there something technical going on? I'm not the slightest bit versed in all of the technical aspects but does removing the slight amount of movement in the trigger pin remove a slight bit of creep?

    Just for the record, the reason why I use the word slight is because I tried the KNS pins out with a Mil-Spec trigger that was included in a DD parts kit and I didn't notice any reduction in creep. I'm assuming it's because the trigger that came in the DD LPK had too much creep to start with.

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    I've found that for the most part, mild creep will go away as the parts settle in. KNS pins probably are helpful in niche circumstances, competition triggers, etc.
    "You people have too much time on your hands." - scottryan

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    Creep attributed to the trigger pin's slight rotation?

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    Quote Originally Posted by BTL BRN View Post
    Creep attributed to the trigger pin's slight rotation?
    I don't know....That's the only thing I can think of since the KNS pins wouldn't change anything else.

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    Quote Originally Posted by Obscenejesster View Post
    I don't know....That's the only thing I can think of since the KNS pins wouldn't change anything else.
    They make different diameter pins. A thousandth or so could change the way the engagement surfaces interact.
    "You people have too much time on your hands." - scottryan

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    Quote Originally Posted by markm View Post
    They make different diameter pins. A thousandth or so could change the way the engagement surfaces interact.
    Cool....Makes sense. I suppose I will never know unless I buy some digital calipers.

  7. #7
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    Solution is to use the original pins.

    Quote Originally Posted by Obscenejesster View Post
    Cool....Makes sense. I suppose I will never know unless I buy some digital calipers.



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    Quote Originally Posted by Iraqgunz View Post
    Solution is to use the original pins.
    Eh...I've already removed the trigger pins 5 times and don't feel like doing it again. I think I'll just keep the KNS pins in for now. They won't hurt anything and the trigger feels better with them.

  9. #9
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    The advantage of the KNS is that the side plates keep the pins in a fixed relationship; the pins cannot move away or towards each other as the trigger is pulled, while milspec pins can move towards each other just a bit as the trigger is pulled, adding just a bit to perceived creep. Don't think rotation has anything to do with this. While I had the same positive feeling about the trigger pull with my KNS pins as the OP, I ended up with the same creep free trigger pull by using Geissle's pins, which are slightly oversized compared to milspec, while made of harder steel and requiring no allen wrenches for disassembly, compared to KNS. Not sure if the ALG pins are the same as the ones sold with the Geissle trigger sets. If not, I would get a set of G pins.

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    Quote Originally Posted by mpom View Post
    The advantage of the KNS is that the side plates keep the pins in a fixed relationship; the pins cannot move away or towards each other as the trigger is pulled
    This is at the sacrifice of the pins being allowed to roll in the lower. Without that, all the friction is forced onto the pin. Possibly a non-issue... but guys have made the argument over the years that if the pin fails, it can damage the lower pin hole.
    "You people have too much time on your hands." - scottryan

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