The Magnum Research MLR-1722 Switchbolt .22 LR Semiautomatic Rifle boasts semiautomatic action and has a 10+1-round capacity. It's built with a threaded aluminum-tensioned barrel and a synthetic stock with an ambidextrous thumbhole. Magnum Research MLR-1722 Switchbolt .22 LR Semiautomatic Rifle - Rifles Rimfire at Academy Sports