The Premier Mag by Midwest Elite Airgun benefits the shooter in 4 main ways: 1. Higher capacity of ammo .177 caliber 39 shots .22 caliber 34 shots .25 caliber 29 shots .30 caliber 25 shots 2. Ambidextrous able to use one mag for either the right- hand or left-hand side of the gun, depending on how you load it. 3. Will hold ammo up to 13mm in length for better BC capabilities. 4. Proprietary Belt system.