Well, here's the final update. During the course this weekend, I put another 300 rounds through the XCR with the use of the suppressor. When I wasn't using it, I left it on the range with all the swirling dust and dirt. This thing is absolutely filthy. So much so, that I can't stand it anymore and I'm finally going to clean it up. I can feel the dirt dragging and grinding on the bolt when I cycle it....UGH!
Final round count? 1,500 rounds. The last 500 with a suppressor attached.
No cleaning, although I did pull a bore snake the clear out the chamber at the 1,000 round mark.
Except for the previously noted issue of having the ejector screws starting to loosen, The rifle ran perfect. No jams of any kind.
I officially pronounce the Robinson Arms XCR fit for duty. My recommendation....buy with confidence if it strikes your fancy.
Erik