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Thread: AX556 lower proprietary hammer pin and Geissele Trigger

  1. #1
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    AX556 lower proprietary hammer pin and Geissele Trigger

    So I am looking at building my last AR15/M4 style firearm. Despite 16 years of experience with the traditional lower platform I've decided to give an ambi lower a try for this build (I am left eye dominate).

    I am split between the cartoony ARFCOM lower (hate that logo/website engraving, but love the layout) and the AXTS AX556.

    They both come out to roughly the same price once you add the BADASS and Norgon Ambi to the ARFCOM. However, the AX556 uses a proprietary anti-rotation hammer pin and that has me a bit concerned as I use Geissele FCG's and I know that a G FCG isn't to be used with KNS Anti-Rotation Pins (Primarly due to hardness, and secondarily due to size spec's) and I am wondering if that carries over to the AX556 pin.

    The AX556 pin:
    "This precision heat-treated (case 58-60 Rc) hammer pin allows the use of all aftermarket triggers and helps to eliminate creep."

    Any experience with the G/AX556 combo? Any thoughts on using anything but Geissele pins?
    Last edited by phx223; 04-02-13 at 13:01.

  2. #2
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    Get the AXTS lower! I had an Arfcom lower, the AX556 is above and beyond. My AX556 has a Geissele SSA trigger with no issues. I did have to take some training time with the AX556. I just wasn't used to the ambi design.
    Last edited by NoveskeFan; 04-05-13 at 11:19.
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  3. #3
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    I have two AXTS lowers with Geissele SD-3G triggers installed in them....and I haven't noticed any issue with regard to how the triggers feel...and don't foresee there being any reason to be concerned. You could always contact Geissele with this question though, as I'm sure they'd be able to give you a good answer.

    Also, I don't know for sure...but you could probably use the standard Geissele hammer pin in the AXTS lower without issue, if you're so inclined. I don't see any reason why the AXTS lower would require the use of the AXTS pin. They should all be the same diameter, at least.

    As far as AXTS vs. afcom lowers...Well, all I can say is that I'm very very impressed with the quality, craftsmanship, and features of the AXTS. They're easily the nicest lowers that I've encountered in every regard...and I've owned lowers from Colt, LMT, Bushmaster, Heckler & Koch, Noveske Gen1, and Gen2. There really isn't a single thing about the AX556 that I would change or do differently...And they aren't arfcom branded!
    Last edited by MikeCLeonard; 04-02-13 at 20:44.

  4. #4
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    Those AXTS lowers are really nice but $430 for a lower seems like a lot. Of the two you mention I'd get the AXTS hands down but that' just me.

    I can't answer your question regarding the trigger pin. You might also consider a Lancer L15 which has an ambi mag release but is also forged and has a cool interchangeable mag well. They're only around $200 and come with a magazine. You'd still have to add the Norgon though in order to have ambi mag release.

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    Get the AX556 lower. I have 4 of them, and they ar AWESOME!

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    Geissele's advice on my Colt 9mm was to run their pins and not the KNS.
    I'm not sure if that is just 'not invented here' speaking or if there is a compelling reason, but Geissele makes good stuff and I have a lot of respect for them, so I took their advice.
    Having tried the trigger both ways, I could not note a difference in weight of pull or cleanliness of break; it was just fine with both types of pins.
    Moon

  7. #7
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    Also, for what it's worth, I have ran one of my AXTS lowers in full auto with a short uppers and my RDIAS with over 10,000 rounds, and no pins have failed in it. The AXTS pin is plenty durable.

    Quote Originally Posted by phx223 View Post
    So I am looking at building my last AR15/M4 style firearm. Despite 16 years of experience with the traditional lower platform I've decided to give an ambi lower a try for this build (I am left eye dominate).

    I am split between the cartoony ARFCOM lower (hate that logo/website engraving, but love the layout) and the AXTS AX556.

    They both come out to roughly the same price once you add the BADASS and Norgon Ambi to the ARFCOM. However, the AX556 uses a proprietary anti-rotation hammer pin and that has me a bit concerned as I use Geissele FCG's and I know that a G FCG isn't to be used with KNS Anti-Rotation Pins (Primarly due to hardness, and secondarily due to size spec's) and I am wondering if that carries over to the AX556 pin.

    The AX556 pin:
    "This precision heat-treated (case 58-60 Rc) hammer pin allows the use of all aftermarket triggers and helps to eliminate creep."

    Any experience with the G/AX556 combo? Any thoughts on using anything but Geissele pins?

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    Quote Originally Posted by mkmckinley View Post
    Those AXTS lowers are really nice but $430 for a lower seems like a lot. Of the two you mention I'd get the AXTS hands down but that' just me.

    I can't answer your question regarding the trigger pin. You might also consider a Lancer L15 which has an ambi mag release but is also forged and has a cool interchangeable mag well. They're only around $200 and come with a magazine. You'd still have to add the Norgon though in order to have ambi mag release.
    Take a nice billet lower and add the ambi features (the Mega Ambi billet is $237.00). The Norgon ambi mag release alone is $90.00. Now think about how much the right hand side bolt lever would cost and then add the additional hardware that comes with the lower. Now consider that the AXTS has a feature that no one else in the game has. $430.00 sounds a lot more reasonable now, doesn't it?

  9. #9
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    L15 plus $90 for a Norgon, assuming you need/want it would only be $290 MSRP, and it's forged.

  10. #10
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    Quote Originally Posted by mkmckinley View Post
    L15 plus $90 for a Norgon, assuming you need/want it would only be $290 MSRP, and it's forged.
    Billet lowers cost more than forged. Plus, you would still be missing the magic ingredient.

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