I am thinking o purchasing this shot gun. The only problem is it's a 16 gauge. I am wanting to get a twelve gauge. So my question is can i change this barrle out to a 12 instead of a 16? Also is the 16 gauge good for bird hunting or better for turkey's. I believe 12 gauge is the best turkey gun, at least in my past experiences. So i asking for any input on this thread?