I just bought my first Savage, a Model 24B-DL chambered with .22mag over a 20ga. at an antique show. However, I am a bit confused as the gentleman who sold it to me said that the round slide button on the left side was the barrel selector. Once I started researching it I realized that the hammer also has a barrel selector switch made into it. Is this a factory setup, or did I just get taken to the cleaners with a gun that has a mis-matched system? When I first saw the hammer selector I thought it was a safety!