Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_19901_1 (muzzle_device VARCHAR, colt_model_no VARCHAR)
### Question:
Which muzzle devices are on the Colt 603? 
### Answer:
SELECT muzzle_device FROM table_19901_1 WHERE colt_model_no = "603"