This item is a Recoil Buffer from ProMag that fits the Ruger 10/22 Charger. The Ruger 10/22 and Charger recoil buffer is manufactured from high density polyurethane. The buffer replaces the bolt stop pin and greatly reduces the possibility of damage caused by the bolt battering the recoil pin. The buffer eliminates metal to metal contact. The buffer is light weight and extremely durable. The recoil buffer is a drop in replacement part requiring no modifications. The buffer is unaffected by oils or solvents. The buffer fits the Ruger 10/22, Charger long rifle and 10/22 Magnum rifles and carbines. Features: Made of high density polyurethane Replaces the bolt stop pin Reduces the possibility of damage caused by the bolt battering the recoil pin Eliminates metal to metal contact Lightweight and extremely durable Unaffected by oils or solvents Made in USA