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Hi James and welcome. This will be well into the 45K to 50K range with normal use before any barrel replacement may be needed. Cheers, stay safe and enjoy!

According to the Sig 550 military trial requirements, the barrel must last a minimum of 15,000 rounds. Your 556 has a similarly treated barrel (nitride) and the military test included automatic fire, so I would say at least 25k rounds for your semi-auto only 556.