Geissele has put up a product page for the HICAR, dumped A bunch of still product images and provided lots of details
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Features/Specs
-"BB-62" Reinforced bolt (this suggests to me modified bolt lugs, an oversized bolt or both)
-11.5in GNB-200 barrel (Super Steel developed in cooperation with Carpenter)
-"GZX" Rifling (licensed PXT?)
-Tri-port Phased Array gas system (I've heard it described like a water can spout, lessening intensity but keeping flow the same)
-28 1/4in collapsed, 31 1/2 in extended
-6.6lbs
-Riveted in steel cam track
-"Enhanced BCG"
-Rail is designated MK-24
-Custom Gas system length
-5/8x24 muzzle thread (The SOLGW MK-1 also does this, something about accuracy)
-Custom Buffer (wonder if it's just custom mass or they've shortened it with a steel body or something to increase stroke length, but that would require a non standard gas key)