http://www.rowanengineering.com/products10.htmThey have a lot of nice things for your Regal XL. Trigger guard upgrade is highly recommended. The single shot tray is absurdly cool.The sling studs should be standard imo. I had a slow leak in my rifle and sent it back to AOA for repairs. AOA fixed it under warranty and installed the studs for me. They did an excellent job. Will put her to work next fall for sure.