I don’t have the SKU as I purchased it used from a friend who was hard up to pay his bills.
Post a pic and we may be able to tell you.
Sorry to reanimate a dead post, but I’m trying to figure out what type of barrel is in my upper.
SKU is 31013.
I’m fairly certain it is a FN barrel, but no idea if it’s CHF or not. Any assistance would be greatly appreciated.
Welcome to the forums @chrisjm981 
The premium uppers do come with FN CHF barrels.
I saw the newer ones either have nitride CVM or phosphate CHF. My upper is from early 2013, so I figured I’d ask.
In 2013 they were for sure FN CHF.
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Awesome, thanks!