Geissele Automatics usage in 416 uppers.
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Thread: Geissele Automatics usage in 416 uppers.

  1. #1
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    Default Geissele Automatics usage in 416 uppers.

    So, I have recently finished my Brownell's build. All HK parts including the uppers. I decided to use a Geissele Automatics fire control group in the lower. The hammer will not impact the bolt/firing pin with enough force to set off the round thanks to the pesky lifting lever in the top of the bolt carrier. Is this a safety device to prevent Accidental discharge?
    Can it be removed or am I forced to use the FCG that came with the kit?
    Thanks

  2. #2
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    I found the answer online. It can be removed but is not recommended. So any advice out there?

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    Geissele makes a 416 specific FCG that has a hammer high enough (Mil-Spec) to lift the firing pin safety. You can remove the FPS if you wish, but it is a safety feature to prevent the firing pin from impacting the primer with the heavy buffer spring on the HK416. I’d use the HK416 specific FCG from G and then you don’t have to worry when chambering a round.
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    There’s a whole thread here about what triggers work and don’t work with the HK416 carrier.

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    Use the OE FCG or replace with an ALG ACT or Geissele MR556 FCG. Just my .02

    I believe the BCM PNT would also work but I haven't tested it personally...
    On ne voit bien qu'avec le cœur. L'essentiel est invisible pour les yeux.

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    Comprehensive information here: List of compatible trigger groups
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    LaRue is working on a full auto trigger that was just on Instagram being tested with a HK upper.

  9. #8
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    It's not a force issue, Geissele hammers aren't tall enough to disengage the safety. You have to use a mil-spec style or HK416/MR556 specific Geissele trigger.
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    Quote Originally Posted by Jdyer View Post
    So, I have recently finished my Brownell's build. All HK parts including the uppers. I decided to use a Geissele Automatics fire control group in the lower. The hammer will not impact the bolt/firing pin with enough force to set off the round thanks to the pesky lifting lever in the top of the bolt carrier. Is this a safety device to prevent Accidental discharge?
    Can it be removed or am I forced to use the FCG that came with the kit?
    Thanks
    Call Geissele direct and they will tell you exactly what you need. I bought a Geissele SSF trigger for my MR556 lower/HK416 upper with RDIAS build and it has worked flawlessly (not one malfunction) in over 5000 rounds. And IMO Geissele triggers are, dare I say it, better than the original HK OEM triggers.

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    Thanks everyone. I knew the members would not fail me!

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