Originally Posted by Kokanee
Yes, but OA built an alternate recoil system so they wouldn't have to use a buffer tube. In this case, VFC just eliminated the buffer and called it "win"; carrying on the long line of AEG manufacturers who produce products that if they were real, wouldn't work at all. Obviously displaying their lack of knowledge when it comes to how an AR-15 actually works.
I know, but the restricted portion remains the receiver, which in this case lacks and functions without the recoil buffer tube; so the "tubeless" lower remains a replica of a real firearm's lower (even though the legalities don't work that way, I'm just indulging the OP's question). I mean you could technically throw on a normal upper on it I suppose (it wouldn't function, but that's besides the point I guess).