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"
### 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"