Those are just normal upper and lower receivers pictured together, not some kind of integrated unit.
ADS is a relatively new player on the scene, but their quality seems to be pretty good. They were highly touted on the M4Carbine.net forums when they first came out (this was before Charles Daly became the new flavor of the month), and recently had a positive write-up in SWAT magazine.
LOL I was kinda wondering about that. Didn't seem upgradable if they were pinned together!
Oh well. It was an interesting idea I guess!
I saw them like that at Lowers while looking for stripped lowers then went to the ADS website and saw them again. There was no explaination on them so I thought HOLY ! They also make them in multipule colors aswell.