I ordered a mount for an AR-10. Unfortunately there are two different mounts for two different AR-10 magazines and I picked the wrong one. I emailed on a Friday evening and had a response back that evening. Had to continue the conversation on Saturday to work out all the details but had the correct mount shipped out early the next week. Completely not their fault, yet they did everything in their power to get me the correct mount ASAP and make sure I was completely satisfied. Shockingly great customer service, really cool product, definitely recommend.