The maglula loader/unloader is simple to use in either loading or unloading mode.The loader/unloader eliminates thumb pain, wear on feed lips, and prolongs magazine life.It is crafted from durable reinforced polymer, lightweight, and is reliable in all weather.This model is compatible with ruger 10/22 bx magazines.Caliber: 22 LRCapacity: Mag LoaderFinish: BlackModel: Loader and UnloaderMaterial: PolymerType: Loader/UnloaderModel Fit: 10/22Brand Fit: RugerCapacity: Mag Loader