What do I do with this?

[Ex313]

I have a basic 2 stage Geissele trigger I put in an Anderson lower.
When I shoot the rifle, the bar that holds the hammer in place starts to walk toward the side of the lower where the safety selector is.
The Trigger group is out of alignment and then the gun won't cycle.
I called Geissele and they sent me this part.
I'm not sure where it goes and what it does.

Can anyone tell me?

 

[atljetmech]

Its a hammer pin retainer.
This article will explain it for you:

Installing the Geissele G2S Trigger - Windham Weaponry Online. AR-15 Manufacturer

The excellent Geissele trigger comes with a set of instructions but I thought it might be helpful to provide a pictorial instruction to make it a little easier. First make sure rifle is unloaded then push out the takedown and pivot pins and remove the lower from the upper. Using a 1/8″ or...

www.windhamweaponry.com

 

[GAgunLAWbooklet]

I knew one of us ODT'ers
would tell you
where you should stick it.