Overview Reviews Product Description Mark I (Old Style), blued steel, 9-Round, .22 caliber magazine. Genuine Ruger Factory Accessory Product Videos Custom Field license_required nonrestricted Product Reviews Write a Review Write a Review × Ruger Ruger M-9 Pistol Magazine Mark 1, 22 Auto (REPLACES 604-558) Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *