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Found it on ebay. Its hatsan bullmaster QE adapter. The moderator is some chinese big bore with M18x1.5 threads. The moderator needs to be big in volume so it doesnt effect the back pressure of the reload mechanism piston thats inside the shroud. https://www.ebay.com/itm/202699273553

I have Moderator on .25 blitz. Works just fine. Adapter needs to be m18x1 threads or bigger to work. That 1/2 x 20 is too small to cycle.