I had sent an upper back to Bushmaster that I bought a couple of years ago. The upper had a problem with excess windage. You had to adjust the reflex sight all the way to the right to get it to zero. They called today to say they had shipped it and that it should arrive Friday. When I asked what I owed they said no charge that they had fixed it under warranty even though the warranty had expired. I don't know what better service you could ask for from a company. Thanks, now if UPS would just show up today with my new M4 upper that I ordered I would be having a great day.