I'm 100% certain they don't sell ARs to civilians, hence no reason to add them to the chart.
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Where does DoubleStar fit on the list?
www.Star15.com
About the same as DPMS.
Had that happen to me last week. The vendor swore the stripped upper was a FN forging. I had no idea if he was giving me a line or not, but when we started talking about my ideas for my upcoming build to include barrels, carbine gas systems vs mid-length gas systems, extractors, HD springs, O-rings, he stated they only are applicable for pistol and SBR applications. If your carbine gas system/carbine-length barrel doesn't function on a stock spring/insert, then there's something wrong with your weapon. I said "enjoyed talking with you" and moved on.