this is relatively simple.
The armageddon will attach to the drop forward by means of a sliding rail system.
However, i am of the belief that A.I.R uses two screws (similar to the ones that hold the drop forward onto the grip, just shorter)
so i think you might have to look at a new drop forward.
i dont own A.I.R so i might be wrong, but from pictures, and other sources, i think my statement is accurate.