This 2-pack of 10-shot rotary magazines for the Ruger 10/22 Air Rifle come in handy when all you want to do is get in some trigger time. These .177 caliber pellet magazines are sold in a two-pack to offer shooters extended shooting and easy magazine changes. Remember "gears to the rear" when inserting the magazine and don't forget to lock the rotary mag in before inserting the magazine into the bottom of the receiver. Compatible only with the Ruger 10/22 Air Rifle manufactured by UMAREX under license from Sturm, Ruger & Co, Inc.