Not really worried about shooting out the barrel, more worried about a broken piston or related part that I couldn't repair without sending the rifle back to Colt.
I'm very interested in these rifles, but stuff does break occasionally. Just wondering if a trip back to the factory is the only way to deal with a broken rifle at this point.
Same issue kept me without a SCAR for a while. Now that spare parts are reasonably plentiful, I have a nice stock of parts built up for any problems.
To answer your original question, I probably average between 4-6 hundred rounds a month. So you would probably be looking at a little over two years before I hit the 10,000 round mark. That doesn't count any training classes that might have 1,000-1,500 round count over 2-3 days. Granted, this is also spread over a number of rifles, so I'll be conservative and say 5-6 years before I would hit that round count on a rifle.