I have purchased a bca barrel 16 inch carbine gas wylde chamber
I have measured the gas port size and it .072 that seems large
Also the barrel is marked 223 instead of 5.56 as was advertised.

I am purchasing the rest of the parts and wanted to know what buffer i should use and if i should buy an adjustable gas block?

I plan on shooting wolf gold and would like the rifle to be reliable with 223 and have the ability to shoot 5.56

Thank you for any recommendations