AR hammer pin drifting out

M

mofosheee

New member
Hello Firing line

Recently purchased a new lower.........assembled with a new parts kit without issue to include a Geiselle trigger. Ran two mags without issue except that the the hammer pin had illegally migrated out of the left side of the receiver, approx 0.125"

Reviewed the Midway and Brownells online tutorials to confirm proper assembly and searched the forum for a solution. I'm not understanding the errors in my assembly and prefer not to install an anti walk kit.

Please advise.
Thanks
 
The hammer has a detent to engage a groove in the middle of the hammer pin to keep the pin from walking out. On top of that the hammer spring puts load on the pin. These two put together, the pin should stay put, at least so for the milspec (cheap) ARs.

-TL

Sent from my SM-N960U using Tapatalk
 
tangolima said:
The hammer has a detent to engage a groove in the middle of the hammer pin to keep the pin from walking out. On top of that the hammer spring puts load on the pin. These two put together, the pin should stay put, at least so for the milspec (cheap) ARs.

-TL

Sent from my SM-N960U using Tapatalk
Click to expand...
Exactly. There is a little spring in the hammer that is supposed to lock into the groove in the center of the pin to keep it in place. Id verify that its installed correctly, kinda snaps into place, shoot it again to confirm the problem. If it walks again call the Manufacturer. If it does not you solved the problem.
 
I haven’t heard of or experienced this except in cassette type triggers, and for that matter, I’ve only read about this happening in cassette type triggers.

I do have one lower with anti-walk pins, but they cam as a bonus with the trigger.
 
I haven’t heard of or experienced this except in cassette type triggers, and for that matter, I’ve only read about this happening in cassette type triggers.
Click to expand...

Exactly. That is why Geiselle says to contact customer service and why they have multiple pin sizes available.
 
With ANY cassette type AR trigger, i always install anti-walk pins. With a “mil-spec trigger” one leg of a spring holds the pin in place.

Cassette= Anti-walk pins……sorry.
 
No word back from the OP?

In mil-spec triggers (I know this is similar, but not exactly the same), I've never seen a hammer pin walk, but have seen a few trigger pins walk if the hammer spring was installed improperly.
 
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