Which muzzle devices are on the Colt 603? 
CREATE TABLE table_19901_1 (muzzle_device VARCHAR, colt_model_no VARCHAR)
SELECT muzzle_device FROM table_19901_1 WHERE colt_model_no = "603"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_19901_1 (muzzle_device VARCHAR, colt_model_no VARCHAR) Question: Which muzzle devices are on the Colt 603?  [/INST] SELECT muzzle_device FROM table_19901_1 WHERE colt_model_no = "603" </s>