Designed to precisely fit Rossi Long Gun Barrels on the R92 models. Includes th scope base and screws to put a scope on a barrel. Be sure to firmly attach the base using the supplied screws. Failure to firmly install the scope mount base could cause the base to come loose during shooting and create a hazardous situation. If you are not comfortable with this mounting procedure, do not attempt to do this yourself. See a certified gunsmith or licensed dealer for assistance.