Those carry handle uppers are pretty spendy and sometimes hard to obtain, I had wanted to make an A1/A2 clone but lost interest before I could ever get my hands on one.
What era are you wanting to replicate? There are differences between the years besides just carry handle or flat top.
I own a 16” FN CHF barrel and it pretty good, not as accurate as my unlined barrels. The difference is minimal and not scientific; so it’s merely my perception and opinion and not stating as fact.
Also, military m16s didn’t have CHF barrels, but in theory CHF is good to go.
I would get one of the FN barrels from PSA if they have what you want. I like their products just fine.
I will probably end up building a flattop government fakery as I had given up on the carry handle upper
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