Christie's Accessory Mounting Base is specifically made for the Ruger 10/22. It has a very low profile design so that your scope can be mounted as close to the receiver as possible.There are plenty of slots for mounting accessories where you need them. The base uses the weaver or picatinny style. The bottom of the base has the same radius as the receiver guaranteeing a tight fit. It is easy to install and fits right in the the holes that are already drilled and tapped in the receiver. All screws and the hex wrench you need are included. The accessory mounting base is made of a 66% nylon polymer with with 40% mineral fill. It is durable and resists oil, grease and solvents.