BudsGunShop.com - is the trigger

I suggest that you ask coly as they have used plastic, aluminum, and MIM triggers in the past Also the triggers are easily replace with many good aftermarket trigger. Tel: 800-962-COLT (2658) *Mon-Fri 9am to 5pm EST
Fax: (860) 244-1379

Colt has used polymer triggers on some models in the past. They've also used blackened aluminum. Generally, the polymer triggers seemed to have worked out fine. I can't find if this model has one or not. But that doesn't seem to be necessarily a reason to not get the pistol if you want it.