The CT ban pre dates the Federal ban for one. Many weapons are banned by name. So the AR-15's that arent named in the ban and were manufactured before the ban was implemented are highly desireable as you can have all the evil features. CT AWB forbids more than two evil features. High Capacity Mags Pistol grip Threaded Muzzle folding/Collapsible stock Bayonet lug We mostly seem to see Essential Arms, Bushmaster and Olympic Arms.