should be fine if its not a real ar10 from the 50's. they have very few points of wear, and the stressed parts, the bolt and barrel extension should have a safe life far beyond the useful life of a barrel and you replace them together. Check your barrel though, if it says "308 winchester", and your in SAAMI pressure limits should be good. I know pushing 150's to 2700 from my 18" wasn't even enough to lock the bolt back on empty with the rifle buffer. Does with a carbine buffer. (yes I switched the extensions)