No longer do you have to rebuild your upper receiver or buy a new rifle to have the side charging capability!! Devil Dog Concepts' Side Charging Handle System; The HARD CHARGER (HC) Tactical drop-in system mounts to the 3rd Picatinny slot replacing the existing charging handle, turning your rifle into a side charger. No Machining. No modifications. The Hard Charger mounting option leaves available mounting rail space to rear for Optics and Back Up Sights. Mil-spec anodized 7075 Aluminum, Stainless Steel,and Impact Resistant Polycarbonate. Weighs under 5 ounces. 5 year manufacturer warranty.