Hello, my name is Mihai, I am from Romania and I've just bought an Benelli R1 Confortech. The model is for USA ( 56 cm, not 51cm like in europe) and the piston is with rings. Here in Europe just came up a new type of piston. What do you know about this?i699.photobucket.com/albums/vv351/violiv/P1000727.jpg