Fits RugerA(R) 10 / 22A(R) models and variants in .22 LR Does NOT work with Standard 10/22A(R) stocks Magazine body constructed of legendary high strength, carbon fiber and glass reinforced black polymer Injection molded magazine follower, feed lip insert, & base plate Magazine spring formed from heat treated chrome silicon wire No sleeve - available separately for purchase (AA110) Lifetime Warranty Made in USA Mfg: Pro Mag