Alright, here's my photoshop mockup. Obviously easier said than created in the real world, but just mocked up to stimulate discussion.
So the idea is as follows: Single shot straight pull action, using a Remington 870 trigger group (just for shts&giggles) Gas system is blocked, or non-existant altogether. There is no capability to feed with a mag, it is single shot through the ejection port only.
-Pull the bolt back after every shot, and it locks to the rear.
-Insert fresh cartridge
-Depress the bolt catch to let the bolt go forward
-Forward assist if thats your cup of tea
-Fire, and repeat.
IMHO, since the AR15 upper is not classified as a firearm, a compatible lower receiver which shares no common mode of operation at all and no commonality of parts in the fire control group can't conceivably be classified as restricted.
Looks a little like the Cali-AR15's you see out there......
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That looks fantastically uncomfortable to hold.



















































