Being looking around and cannot find any reg for this rifle. Huma and Altaros don't appear to manufacture one. They do have for the Brocock Contour Elite S6 but as I understand the "Elite" version has a larger diameter air tube.
Need to check with Audrius but I doubt that they will have it as it is not listed.
http://laneregulators.com/shop/tuning-p ... et-brocock
Check the drop down menu and see if those will work. Not sure if the "Contour XL" and the "Contour S6" are the same. The internet doesn't seem to know the difference from my search lol..
Lane regulators have always worked great for me. Maybe he has one. Shoot him a message if not, he may have one that will fit.