AR trigger pin

The trigger pin or the hammer pin? They're identical but they are retained in different ways. The trigger pin stays in place because the hammer spring leg sits in a groove in the pin.
The hammer pin stays in place because of the j-spring in the hammer.
Check to see that your j-spring is still in the hammer and/or that your hammer spring leg is sitting in the groove in the trigger pin.

You can also buy anti-walk pins but 99% of ar15s don't NEED them
 
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