If you want a inexpensive setup to shoot .22 in your Delta Wolf here ya go. It is a 600mm impact kit that has had the rear oring groove filled and the whole thing turned to fit the Delta. The pellet probe is a Huma wildcat that has been cut down and drilled and tapped. I have been using this same conversion process on a RTI barrel for a long time. The brass sleeve will slide up in the front barrel support if you want. Price is $400 shipped. Its $360 in parts alone. I have a few magazines in Carm and Daystate at additional price.