I have this NEF Handi-rifle in 223 I no longer use. I sent in the reciever and had it fitted for two shotgun barrels - a 12 ga. rifled slug barrel with rifle sights and a 12 ga. turkey barrel with a screw in choke. It comes with an extra butt-stock (one raised for scope shooting and one not).
This is a nice rig and I get about 1.5 inches at 100 yards off of a bi-pod.
$300 + actual shipping to your FFL or face to face in Ohio (Norwalk).