These are great technical discussions but there is a lot information we don't know about when it comes to timing. I would like to see a timeline of when the bolt starts to unlock, when the gas tube is clear of the carrier key (and vents), bullet uncork etc.
You can find a report called "Comparison of a theoretical and experimental study of the gas system in the M16A1 rifle" August 1971, BRL Report 1548, somewhere on the internet. Lots of good background on the firing sequence and things they tested.
I started this thread below which did have some good discussion about port size and dwell:
https://www.m4carbine.net/showthread...rel-Discussion
I want to say Tom12.7 mentions a +1" gas system on the 11.5 as being beneficial. He is a good resource for these discussions.
For me, I would be interested in why gas trap systems went out of vogue. The Vltor FOG system was similar and it never went anywhere. I had one of these uppers and sold it before my suppressor came in... kicking myself!
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