American National Firearms set of 3 polymer bolt buffers for Ruger 10/22, 10/17, SR-22, Charger or other gun built on the Ruger 10/22 receiver platform. These highly effective buffers are made from a sturdy, ridged polymer that is not affected by cleaners or lubricants. These install easily in just a few minutes and fit perfectly. A bolt shock buffer is absolutely the best single upgrade you can do to your Ruger for the low cost. Made in the U.S.A. with a lifetime warranty. Comes in a set of 3 so you can upgrade three rifles or have spares to share with your friends.