The maglula scar h/17 lula loader/unloader loads 10 20 and 25 round scar h/17 type metal and polymer 7.62x51/.308 magazines. It is simple to use in either loading or unloading mode. The loader/unloader eliminates thumb pain and wear on feed lips. It also prolongs magazine life. It is lightweight and small enough to fit in your pocket. The loader/unloader is crafted from durable reinforced polymer and is reliable in all weather.Caliber: 308 Winchester / 7.62x51 NATOFinish: BlackMaterial: PolymerType: Loader/UnloaderModel Fit: SCAR H 17