CREATE TABLE table_19901_1 (trigger_pack VARCHAR, rear_sight_type VARCHAR, colt_model_no VARCHAR)

What is the trigger pack on the Colt 602 with the a1 rear sight type?
SELECT trigger_pack FROM table_19901_1 WHERE rear_sight_type = "A1" AND colt_model_no = "602"
SELECT "trigger_pack" FROM "table_19901_1" WHERE "602" = "colt_model_no" AND "A1" = "rear_sight_type"