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Expert Answer
When trigger pins are referred to as "anti-walk" it means that they will not "walk" out of the receiver when shooting or in use. Anti-walk pins are not normally needed for a standard mil-spec style trigger where the trigger parts are installed piece by piece in the lower as the tension from the trigger should hold them in place. Anti-walk pins are often used for drop-in style cassette housed triggers as the pins could potentially wiggle themselves out of the lower receiver from heavy use.