I read about them during and right after the 2012 Shot Show. I don't think RRA has actually put them into production yet. And, with all the demand for AR-15 style rifles, they may not get around to doing so for awhile.
Jim's Rules of Carry: 1. Any gun is better than no gun. 2. A gun that is reliable is better than a gun that is not. 3. A hole in the right place is better than a hole in the wrong place. 4. A bigger hole is a better hole.