This is a brand new 3/8″ height SCOPE RAIL for the Ruger 10/22. It is CNC machined from billet T6 aircraft aluminum and is reversable. Is an adult shooting? Put it on like normal. Is a child shooting and needs the scope closer? Flip the rail around and move the scope back. This quick and easy upgrade will make your firearm look and function better. You will love it! See our other items for more GOLD PLATED 10/22 parts!