The CO2 powered Umarex 850 Air Magnum M2 air rifle in .177 caliber is a smooth and accurate rifle platform. The pleasure of shooting the 850 M2 is only made better by adding spare magazines to the mix. This spare 8 shot magazine is made to the same specifications as the magazine that ships with the 850 M2. These magazines are long enough to house a wide variety of pellets designs and will also fit in the original Hammerli 850 Air Magnum chambered in .177 calibre.