It is a one-of-one, built by hand, by CoolHand.
Body and pump are 6061 T-6, built from scratch. Uses 'cocker threaded barrels, AKA threaded feed tubes, and Angel threaded ball detents. Uses second gen Sterling lower tube hardware (hammer, sear, valve, etc), and a second gen Sterling bolt and pump arm. It is set up for a vertical bottle in front of the frame, and has a stainless steel hardline that runs from the VA to the valve body in the rear. It has a second gen Sterling aluminum frame, and comes with the CCM feed neck pictured. There is also a delrin sleeve that goes inside the pump handle to prevent the aluminum pump handle from marring the finish on your barrel.
I've added some parts and had some modifications done to it. I had another angel threaded detent on the other side, dual pump arms installed, the back of the bolt turned down to be used with an aluminum back block. The frame was t-slotted to use a P.E. OOPS ASA and I had a AKA threaded Cram & Jam adapter made. . I now have a 12gram cartridge changer. All that is left is for me to buy a reg to have when using HPA and purchase the ASA, well and anodizing.
Current pictures of modifications.
CCM Cram & Jam AKA threaded adapter.