I've been shooting skeet for about a year now and I'm thinking about shooting some registered targets. I have a Citori 12ga that I shoot pretty well and have a 20ga version. I was thinking of getting some Briley 28ga and 410 ga full length inserts. My question is should I get the tube for the Citori or try to find a complete package i.e. new gun with tubes already fit? Are the chamber inserts really worth the money?