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

### Instruction:
What is the trigger pack on the Colt 602 with the a1 rear sight type?

### 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 Trigger pack FROM table WHERE Rear sight type = A1 AND Colt model no. = 602