I own Aridus Industries and make the accessories on it.

The parts in red were a limited run but are available in black. 

It has the YT-1301 Latch and Shroud (replacement bolt release to eliminate the shell dump malfunction on the first generation of 1301s), the ASA-1301 Stock Adapter, the 1301/ Aimpoint CROM (optic mount), and the Universal Q-DC side saddle.