All great advice above but just be damn sure to consult Greg Vess before ANY purchases or assembling. He’s on this site and is a wealth of knowledge on AR-10s and well…just life in general.
Leupold will make it right I bet. Good people. I broke a pair of binos that were almost 10 years old. Sent them in and they sent me a brand new pair of the closest model as mine weren't even made anymore. I was beyond impressed.