Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which muzzle devices are on the Colt 603?

### Inputs:
table_name: table, columns: ['Colt model no.', 'Military designation', 'Barrel Length', 'Barrel', 'Handguard type', 'Buttstock type', 'Pistol grip type', 'Lower receiver type', 'Upper receiver type', 'Rear sight type', 'Front sight type', 'Muzzle device', 'Forward assist?', 'Case deflector?', 'Bayonet lug?', 'Trigger pack']

### Response:
SELECT Muzzle device FROM table WHERE Colt model no. = 603