The thread is only 2 pages man, and it has the answers you're looking for:
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someday rifles like this will be in museums. limited in number, odd in look and function (probably worth a crapton). firearms historians will recall that these were made because of confusing legal parameters placed on law abiding citizens.
I hope your right Trinydex
Comb looks way too low to be used with standard AR-15 sighting options.
Wait til the politicians try to ban this too ... :eek:
Kidding aside, I think its a good work-around to the comical gun laws in many states. Doesn't look bad at all IMO.
If the low comb is an issue, there are tons of lower mounts that can work, especially if it's something like that MOE handguard bottom AR upper in the OP's image - just run low rings or a low aimpoint Micro mount and you're there.