I contacted Trijicon a month or so ago to see if the tritrium lamp in my M&P45c's front sight could be replaced. I made sure they knew that this was purchased used from a third party and that I did not expect it to be warrantied. They said there would be an $18.00 charge and that it could take up to 6 weeks. I sent the slide in to them 3 weeks ago and received it re lamped today with an invoice for $0.00!
Great customer service and great products