Chosen Solution

That little black piece fell out of the controller trigger area. Can I buy a new trigger or do I need a new controller?

Hello Jenni Lawton, There is a way to replace the trigger caps on your controller. Here is the link to a guide showing how to do it Xbox One Wireless Controller Model 1708 Trigger Caps Replacement IFixit does not make triggers but here is one I found on amazon https://www.amazon.com/Replacement-Contr… Hopefully this will help! Happy Fixing! -Javen