walking pin syndrome?

[WetCoast]

45ACPKING mentioned this in he recent EE post.

Can someone school me on this? One of my Norc trigger groups has it. I can guess it indicates lateral forces that shouldn't be there. What causes it? What are the implications etc?

TIA.

WetCoast

 

[45ACPKING]

the holes in the trigger body are not drilled 90 degrees true to the body, causing the pins to sit at an angle.
this can cause the hammer hooks and sear angles to be horizontally off and the pins to move/walk during cycling of the trigger group
not really a huge deal if everything works fine in the rifle.
once the trigger group is in the rifle, the pins are retained by the stock wall (trigger pin) and the trigger guard sides(hammer pin)
but for choosing a trigger to tune or upgrade...... I personally only want ones that don't have walking trigger pins.

 

[WetCoast]

I always wondered why it walked out as I was breaking in my trigger group.

Excellent info. Thanks for sharing that!

the holes in the trigger body are not drilled 90 degrees true to the body, causing the pins to sit at an angle.
this can cause the hammer hooks and sear angles to be horizontally off and the pins to move/walk during cycling of the trigger group
not really a huge deal if everything works fine in the rifle.
once the trigger group is in the rifle, the pins are retained by the stock wall (trigger pin) and the trigger guard sides(hammer pin)
but for choosing a trigger to tune or upgrade...... I personally only want ones that don't have walking trigger pins.