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
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.
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.
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.
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.
If something broke, call them; they most likely will want the complete trigger back. Just call.
No idea what Geissele today will do but I had a broken hammer (snapped below the strike face in less than 150 rounds) back in 09ish. Threw it in a drawer for 3+ years assuming I'd get dogged on it and found it when I moved. Decided to give 'em a call. They had a new one en route before the call ended.
In regards to your inquiry about just swapping hammers, I don't think that's advisable given the tolerances invovled...I could be wrong though.
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