Too Right...Send it to Fulton Armory and I can already tell you what their answer will be as well as their recommended resolution.
Nice customer service! 29 minutes to respond in a courteous manner about one of your products. I'm impressed.All of our mounts are shipped with a receiver inspection kit that can be used as a trouble shooting tool when installing our mount. The inspection kit provides the required inspection pins, instruction, and diagrams to allow you to check the receiver's left side groove. You can also go to our website and see the inspection process in a photo tutorial. Using the Sadlak Receiver Inspection Kit