Norinco JW-21 Lever-Action Rifle Action: Lever-action repeating rifle with an exposed external hammer. Caliber: .22 Long Rifle (.22LR) — can often cycle .22 Long and .22 Short. Optic Mounts: Integrated 11 mm European-standard dovetail rail machined onto the top receiver. Sights: Ramped and hooded front sight blade paired with a buckhorn/U-notch adjustable rear sight. Safety Features: Frame-mounted firing pin cross-bolt safety or traditional half.