BudsGunShop.com - Meltdown Ammo Count
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What is the round count at melt down for the Sig Sauer M400 Tread 5.56x45 NATO 16" Barrel, 30+1?
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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.