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Posted: 1/16/2015 10:55:01 AM EST

I am getting ready to build a QC10 Glock lower. I want to install a Geissele trigger because...they're awesome, but in a 9mm AR I used to own I broke a hammer pin from a standard parts kit. The damn thing just snapped while I was shooting.

I replaced those pins with a KNS set. I know G triggers aren't supposed to be used with those pins.

So, how well do the G pins stand up to 9mm bolt abuse? What can I do to help prevent breakage? Heavy buffer?

Link Posted: 1/16/2015 11:21:22 AM EST
My understanding is that the geissele pins are made of better steel and are machined to higher tolerances than standard or KNS pins.

They should be every bit as durable as KNS pins (if not more so).

That being said, I think the main contributors to wear are going to be if your bolt is ramped or not, the hammer you use, and your buffer/spring setup. There are also some Geissele triggers that aren't compatible with some 9mm bolts (though I haven't confirmed this myself).
Link Posted: 1/16/2015 12:02:02 PM EST
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Originally Posted By RtotheDizzy:
That being said, I think the main contributors to wear are going to be if your bolt is ramped or not, the hammer you use, and your buffer/spring setup. There are also some Geissele triggers that aren't compatible with some 9mm bolts (though I haven't confirmed this myself).
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Can you elaborate more on that for us 9mm AR newb's?

From what I've read, the SSA-E is gtg, but the S3D is not. No experience to confirm this, but I've read this from multiple sources.
Link Posted: 1/16/2015 1:06:09 PM EST
Just call Geissellle and see what they recommend.
Link Posted: 1/16/2015 1:24:12 PM EST
Originally Posted By Vaquero45:

I am getting ready to build a QC10 Glock lower. I want to install a Geissele trigger because...they're awesome, but in a 9mm AR I used to own I broke a hammer pin from a standard parts kit. The damn thing just snapped while I was shooting.

I replaced those pins with a KNS set. I know G triggers aren't supposed to be used with those pins.

So, how well do the G pins stand up to 9mm bolt abuse? What can I do to help prevent breakage? Heavy buffer?

View Quote


We haven't had any issues of pins breaking or snapping when being used with the 9mm. Our pins are harder than the pins that come with stock triggers. We harden them to a certain specification to ensure they are durable.

-Geissele Customer Service
Link Posted: 1/16/2015 3:57:04 PM EST
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Originally Posted By Arty155:


We haven't had any issues of pins breaking or snapping when being used with the 9mm. Our pins are harder than the pins that come with stock triggers. We harden them to a certain specification to ensure they are durable.

-Geissele Customer Service
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Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Arty155:
Originally Posted By Vaquero45:

I am getting ready to build a QC10 Glock lower. I want to install a Geissele trigger because...they're awesome, but in a 9mm AR I used to own I broke a hammer pin from a standard parts kit. The damn thing just snapped while I was shooting.

I replaced those pins with a KNS set. I know G triggers aren't supposed to be used with those pins.

So, how well do the G pins stand up to 9mm bolt abuse? What can I do to help prevent breakage? Heavy buffer?



We haven't had any issues of pins breaking or snapping when being used with the 9mm. Our pins are harder than the pins that come with stock triggers. We harden them to a certain specification to ensure they are durable.

-Geissele Customer Service


Also great news!

Thanks.


Link Posted: 1/18/2015 3:08:34 PM EST

Greetings,

I built my 9mmAR using the DDLES Glock lower and an RRA bolt ramped and cut by ADCO. Geislee SSA/E using the pins it came with. No problems whatsoever; guessing, but probably have over 4K rounds through it so far. I think with the ramped bolt and correct weight recoil buffer (I used the Slash Heavy) you should have no issues. Hope your build goes well, mine is my favorite AR to shoot.

Regards, Jim
Link Posted: 1/18/2015 8:24:32 PM EST

Great. That's what I am building.

Thank you.

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