This came to me by way of a friend. He said he though it was a Freeflow from way back in the day.
Valve has an o-ring on the stem that looks like its designed to reduce air leakage into the hammer train. Hammer has 2 nylon set screws, one for hammer lug, other for cocking rod. Cocking rod is also unusual, as you can see. has one side set screw, rod appears to travel completely through the nut. Barrel I also haven't seen before. It doesn't wanna come apart. I'd estimate bore at .687 or so based on the paint I have here. The rear bore is tighter than the forward bore. When it came to me, it had a set screw blocking off the front block air passage (Sniper 3 conversion?). Frame is a composite frame. Bolt is an SS, dual o-ring, venturi (looks the same as the STO bolts).
Any help with ID/price point would be appreciated.