I picked up a Marksman 746 .177 today. I need to pick up a breech seal and a piston seal. Don't get me wrong it works just fine, but it needs a breech seal and I figure while it's down might as well change the piston seal also. I believe it was made by Milbro and is supposed to be a Diana design. I just don't know what model to cross parts from. In the pics it is the one under the HW80K.