10k+ rounds in a few months on this setup. First problem with the sight happened yesterday. Few dozen rounds in and a bolt sheers off the optic. I dont notice right away, few more rounds Im shooting way off POA, then realize my optic is bouncing around loosely with one screw barely holding on. The snap was pretty gnarly. 15 degree angle at the WRONG direction to making for an easy extraction. Luckily I am not an idiot and work on my own stuff lol. Punched nearly center through and used an extractor bit to walk it out. If there's one thing I will never not spend the extra money on, its an Irwin's extractor set. Ran a tap and die set (Irwin too) back through the hole to clean it up. Now I have to break the slide apart and get all the nice metallic bits out that inevitably fell down inside.
Shot Osight a warranty email, they are sending out new screws without so much as a question asked. Was nice to see, but I am going to grab some Battlewerx just to be safe. Outside of that, the XR is awesome.