Sorry, I took your post in a less than favorable light. Which we are getting off topic.
As for the opening post, I like to see manufacturers off their consumers a choice.
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I will say that MOST issues with carbine or mid systems are self inflicted by the owner. I have yet to buy or shoot a quality, factory built rifle with an issue. Once home gunsmiths start changing this or adding that, thats when an issues usually occurs. Same goes when building a frankenrifle. Do your research, use quality parts and assemble correctly and your issue will be very minimum, if at all.
Maybe because the Carbine gas is more proven for 14.5 and shorter barrels to be reliable through the following:
More rounds in combat
More tests by all the warfare centers
More tests by SOPMOD program
More combat kills than Mid Gas has or ever will have likely
The military usually uses 16" barrels, so you may ask, why is this relavant to the civlian shooter. When life or death are on the line, many dont need the sexiest, the one that someone feels is more optimal, or whatever else is the flavor of the week. For some, the one that is the most proven to be reliable with a variety of ammo types and in a variety of environments is what is needed. And the most tested under the above scientific and real world tests is Carbine gas. For me at least, the possible positives of the mid length gas arent enough to weigh against the absolute and proven positives of the carbine gas. Others will differ of course, and it has been said before, grown ass man makes his own decisions. I like knowing that I dont have to do the testing myself, so I go with what is proven.
https://www.m4carbine.net/gtsearch.p...rel+&sa=Search
Right point being these uppers are less flexible in what and how they run. If you set it up just right for a certain ammo, it is "better". They do not seem to be as reliable across a broader spectrum of ammo/configurations.
As to the SR15, I feel it has similar issues, and people have reported as such. My personal SR15 upper can't be run in the winter on my lower with an A5 set up. I had to use the carbine system with the SR15 (i think carbine buffer).
Personally my favorite set up has been DD carbine gas 14.5", A5 set up, and a LMT enhanced BCG. Shoots everything and shoots as soft or softer than my SR15.