user: Question: Which muzzle devices are on the Colt 603? 
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']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['601', 'AR-15', '20 in (508mm)', 'A1 profile (1:14 twist)', 'Green or brown full-length triangular', 'Green or brown fixed A1', 'A1', 'A1', 'A1', 'A1', 'A1', 'Duckbill flash suppressor', 'No', 'No', 'Yes', 'Safe-Semi-Auto']
SQL:

assistant: SELECT COUNT("Muzzle device") FROM "Table" WHERE "Colt model no." = '603';