it's clear the ones the responded don't know much about their own rifle. The sear pin is held in place by the stock and the spring pressure of the sear spring. They do walk and will cause problems with inconsistent sear engagement. In Accu-triggers it helps cause the notorious trigger drop that plagues the design.
It will never completely walk out because it is captured by the sides of the stock. However it will back out enough to cause a slight cant in the sier and this is where the problems noted all over the web that people that have one that likes to partially back out causes dead trigger with the accu-trigger.