well, no more than any other. Just thinking physics and the way that problems manifest themselves on forums. But there is really nothing more brutal with a SCAR than any other .308, and that those of us who broke a scope, just happened to do so when mounted on the 17. Since mine is in for repair I mounted a sub $100 BSA and it's yet to do anything but work just fine. So far held up better than the Zeiss, which I think proves I just got a bad one. Obviously a strong well made scope is more durable, and my cheapie scope might have a short life, but it would on a bolt gun as well. I'm going to keep banging out rounds with this scope until my repair gets back. The BSA has even withstood the low teen temps we're stuck in. So far the rifle hasn't even noticed the cold, even as my breath freezes on the receiver.