What is the trigger pack on the Colt 602 with the a1 rear sight type?
CREATE TABLE table_23428 (
    "Colt model no." text,
    "Military designation" text,
    "Barrel Length" text,
    "Barrel" text,
    "Handguard type" text,
    "Buttstock type" text,
    "Pistol grip type" text,
    "Lower receiver type" text,
    "Upper receiver type" text,
    "Rear sight type" text,
    "Front sight type" text,
    "Muzzle device" text,
    "Forward assist?" text,
    "Case deflector?" text,
    "Bayonet lug?" text,
    "Trigger pack" text
)
SELECT "Trigger pack" FROM table_23428 WHERE "Rear sight type" = 'A1' AND "Colt model no." = '602'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What is the trigger pack on the Colt 602 with the a1 rear sight type? ### Input: CREATE TABLE table_23428 (
    "Colt model no." text,
    "Military designation" text,
    "Barrel Length" text,
    "Barrel" text,
    "Handguard type" text,
    "Buttstock type" text,
    "Pistol grip type" text,
    "Lower receiver type" text,
    "Upper receiver type" text,
    "Rear sight type" text,
    "Front sight type" text,
    "Muzzle device" text,
    "Forward assist?" text,
    "Case deflector?" text,
    "Bayonet lug?" text,
    "Trigger pack" text
) ### Response: SELECT "Trigger pack" FROM table_23428 WHERE "Rear sight type" = 'A1' AND "Colt model no." = '602'