Mr Fed Ex just dropped this off, and I mounted it up on my Hatsan AT44S10, and I like it, A LOT!
https://www.amazon.com/gp/product/B079T8XZ36/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
https://www.amazon.com/gp/product/B079T8XZ36/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1