List of HK416/MR556/MR223 compatible trigger groups - Page 20
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Thread: List of HK416/MR556/MR223 compatible trigger groups

  1. #191
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    Has anyone tried the Trigger Tech AR trigger? if so, does it work? Cheers
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  2. #192
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    Quote Originally Posted by mildot View Post
    Has anyone tried the Trigger Tech AR trigger? if so, does it work? Cheers
    This trigger thing has been really inconvenient for me lol through my upper on ready to have a good time and nothing...

  3. #193
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    Anyone try a 416 upper with the fostech echo trigger?

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  5. #194
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    I haven't seen anyone list the . I will be trying out a on a custom lower. If it doesn't work, I will use the lower with something else until I can beat it with a big enough hammer to make it work with the MR upper. Regardless, I will post up my results, but the lower might not be done anytime soon.
    Last edited by PSH11HK; 12-22-2018 at 05:31 PM.

  6. #195
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    Quote Originally Posted by PabloHoney View Post
    I haven't seen anyone list the FA BFS III. I will be trying out a Franklin Armory BFS III on a custom lower.
    Looking at hammer shape, you have more than 80% chance it will work fine with HK upper.
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  7. #196
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    FInished testing on an MR556A1 upper today.

    I built an Andersen Arms lower with their standard parts kit as a throw around test bed for the trigger. I am running an ACE ultralight rifle length stock on it with a Wolf Extra power rifle spring and a rifle buffer spring. I threw it on an extra MR556A1 upper I had stashed away and had never used. It passed all the function checks.

    Today I finally got to go out and shoot it. It just worked. Even binary mode worked with no tuning needed for my setup. I worked the trigger as fast I could and no hammer follow issues and a high rate of fire. I am guessing X RPM. Pretty sure I haven't worked my up to as fast as it can operate, but it was fast enough. The front-heavy configuration was a bit of a handful though. Controlled pairs are pretty easy if you have it firmly planted in your shoulder. I was able to keep a high speed 10 shot group inside of 3 feet at 75 yards working the trigger very fast. I am sure there is room for improvement with practice. My first attempts were very high speed, but they were all over the place, so practice is key.

    After Christmas I will take it apart and clean it and report back if I see any unusual or questionable wear. Hope this helps someone.

    P.S. At some point, I might actually put the trigger group in the HK lower and see if that works as well, but I like the stock MR trigger enough that I don't anticipate testing this anytime soon.
    Last edited by PSH11HK; 12-22-2018 at 05:32 PM.

  8. #197
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    Glad it worked for you. I will update list in 1st post.

  9. #198
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    Swapped in an Elftmann Match trigger into my lower. Tested it with the MR556 upper using a dummy round with a piece of tape on the back to check if the firing pin would puncture it and it did! Should be GTG, as well as the 3Gun version.

  10. #199
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    Quote Originally Posted by Scytheras View Post
    Tested it with the MR556 upper using a dummy round with a piece of tape on the back to check if the firing pin would puncture it and it did!
    That is not enough to make sure it works. Some triggers (like Hyperfire) make firing pin strike primer, but too light for ignition. Test on the range with live ammo. Best with something that use hard primers.

  11. #200
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    Why does everybody like two stage. Is there something wrong with single stage?

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