List of HK416/MR556/MR223 compatible trigger groups
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Thread: List of HK416/MR556/MR223 compatible trigger groups

  1. #1
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    Default List of HK416/MR556/MR223 compatible trigger groups

    This question comes back every so often. So I decided to start this thread. Maybe it can became sticky.

    Purpose is to collect list of trigger groups that work with HK firing pin safety, so can be used either in lower other than HK or dropped into HK lower. Looks like most M16/M4 select fire triggers work with is, so list is of mostly semi-auto triggers. Please take in mind that HK firing pin safety takes some hammer energy to disengage. Using very light trigger setup with light hammer springs can lead to light primer strikers on some brands of ammo (surplus, Russian, etc.):

    ALG Defense ACT
    Armalite National Match 2-stage
    ATC AR-Gold Trigger (needs fitting for MR223 due to rear receiver pin location)
    CMMG Gen2 2-stage
    Franklin Armory Binary Firing System III (BFS III)
    JP Competition Trigger
    JP EZ Trigger
    Geisselle HK MR556
    KAC 2-stage trigger
    RRA National Match 2-stage (CAUTION: Only new version with rounded hammer is compatible)
    TAC-CON 3MR
    Timney AR-15 Skeletonized
    UHL Trigger (German made)
    Wilson Combat TTU-3G and TTU-M2

    I will try to update this list when new info will come in.

    WARNING: Some triggers will not work properly whith HK safety from 2-stage "European" trigger (one that allows to be put on safe with hammer down). Old style HK safety or aftermarket safety may be necessary.

    Remarks:

    Geisselle SSF - standard model reported not to work reliably with HK416, special model required.
    Last edited by Montrala; 12-27-2017 at 08:57 AM. Reason: BSF III added
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    Thanks, Montrala!

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    Thanks - much appreciated.

    I've emailed Geisselle but no reply for over a month :(

    Jp would be easier and their customer service is very good.

    Has anyone tried the UHL trigger? I can get that one easily from Germany.
    Note: Incoming fire always has the right of way

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    UHL works, however it has wery weak hammer spring. It has problem with moderately hard primers, not to mention really hard ones (surplus and Russian ammo).

    For time being I recommend either JP or Wilson Combat. I will use CMMG 2-Stage on next 3Gun match (this Sunday) just to see how it works for me, but it is heavier than JP (I use JP with "tactical" hammer spring, for positive ignition) and has longer reset.

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    Just FYI,

    I had installed a Geissele SSF in one of our dept's Colt M16's some time back when we wanted a "marksman" type rifle in our inventory. I put my 416 upper on it for grins. I was getting very light primer hits with failures to fire about every 5th or 6th round. I tried my other 416 upper with this lower and was unable to get any rounds to fire as there was very light dimpling on the primer. Thus, I would not rate the stock SSF as a reliable option for the 416.




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    Quote Originally Posted by pointblank4445 View Post
    Just FYI,

    I had installed a Geissele SSF in one of our dept's Colt M16's some time back when we wanted a "marksman" type rifle in our inventory. I put my 416 upper on it for grins. I was getting very light primer hits with failures to fire about every 5th or 6th round. I tried my other 416 upper with this lower and was unable to get any rounds to fire as there was very light dimpling on the primer. Thus, I would not rate the stock SSF as a reliable option for the 416.
    Updated. However listed were only special SSA version (that Geisselle offers for almost $400).

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    Quote Originally Posted by Montrala View Post
    Updated. However listed were only special SSA version (that Geisselle offers for almost $400).
    I thought that might be the case. I used the term "stock SSF" to clear up any confusion




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    Funny thing, I just heard about another trigger maker, that does not have HK compatible trigger with exactly same story, that I heard before: "Yes, we made batch of our triggers in HK version on special order for SOF unit, but we do not offer them".

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    I have emailed Geisselle about a month ago about triggers to MR223, but no reply and I don't think I'll get one either.

    According to rumors, they make triggers for SOF units as well ;)

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    Updated:

    ALG Defense ACT
    ATC AR-Gold Trigger (needs fitting for MR223 due to rear receiver pin location)
    Last edited by Montrala; 02-05-2012 at 09:55 PM.

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