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Guys it’s a Colt 6960 16 inch mid length gas not carbine gas..
My URG-I clone upper DD 14.5 mid barrel has .076 gas port & my Hodge Defense 14.5 mid has a .074 gas port.
Edit- .72 wont fit the .071 is tight. Colt actually did an awesome job with there 16 inch mid length barrels .071 is the smallest I’ve seen & there soft shooters.
I’m thinking it might be a little to small cut down to 14.5.
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Yeah, that's the smallest port size I've seen mentioned for a 16" midlength. Searching around, I see that some 16" DD barrels are ported at .072 - .073.
As far as 14.5", the smallest I've seen mentioned is .075" on a 14.5 Hodge barrel.
And while there is no standard, it seems the majority of respected manufacturers are using .076" gas ports on their 14.5 midlengths.
Eh, I guess you will have to open it up.