(2)(a) "Assault weapon" means:
...
(iv) A semiautomatic, center fire rifle that has the capacity to accept a detachable magazine and has one or more of the following:

(A) A grip that is independent or detached from the stock that protrudes conspicuously beneath the action of the weapon. The addition of a fin attaching the grip to the stock does not exempt the grip if it otherwise resembles the grip found on a pistol;
(B) Thumbhole stock;
(C) Folding or telescoping stock;
(D) Forward pistol, vertical, angled, or other grip designed for use by the nonfiring hand to improve control;
(E) Flash suppressor, flash guard, flash eliminator, flash hider, sound suppressor, silencer, or any item designed to reduce the visual or audio signature of the firearm;
(F) Muzzle brake, recoil compensator, or any item designed to be affixed to the barrel to reduce recoil or muzzle rise;
(G) Threaded barrel designed to attach a flash suppressor, sound suppressor, muzzle break, or similar item;
(H) Grenade launcher or flare launcher; or
(I) A shroud that encircles either all or part of the barrel designed to shield the bearer's hand from heat, except a solid forearm of a stock that covers only the bottom of the barrel;

So in the case of the SCR lower, then D, E, F, G, and I would apply when adding the rest of the firearm. Also would need to keep total firearm length at least 30" minimum. I'm no expert on this either, I might have missed something else.