Its 8x57 set up on a what looks like to be a German Kar88. Its double set trigger is the nicest trigger I have ever felt. This setup is original to the rifle. My father just gave this to me so I do not know much about it, but it is by far my favorite rifle, even over my sedgley. It has the Octagon to round ribbed barrel. I can not wait to use this for dear season! I almost dont want to use it its so nice!