I searched all around here and all around Google but couldn't find this info anywhere. Lots of info other about the 18" was easy to find, but couldn't find a gas port size for that one either. The 16" appears to be far less popular. Because of this, I bought the barrel anyway and I used this as an excuse to pick up a pair of calipers I'd wanted for a while anyway. Edit: turns out it was also a good reason to buy a set of pin gauges.
The gas port size is 0.072". Hopefully this will be useful to others who search the internet in the future. Edit: There's an attachment with a different measurement using calipers; ignore that photo. That measurement is incorrect as I did it with the wrong tool for the job. The pin gauge measurement below is correct.
2017-08-01 12-19-15 -0700.jpg
A question for those who have knowledge of such things: on a scale of picky-about-ammo to over-gassed, where does a 0.072" gas port fall for a mid-length barrel?
Edited to update info using pin gauges rather than calipers, as I learned from the replies in this thread.


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