The receiver and ejector forend are the same serial #. I fitted the specialty grade barrels and the ejectors are working properly. Forend is tight, tight ,tight. I tried it with wood removed and same deal. I filed a touch off end of j spring and it is still tight but forend does not fit up as well as before fileing j spring. I work the roller while removing the forend. I am afraid to remove metal off of forend lug on barrels. I cannot remove forend using my fingers. Thanks, Bobby