Pretty much covered above. Your gun is not a collector gun it is a shooter. Briley is a proprietary system, very expensive, and can be used on barrels too thin for other systems. The other system was originated by Truchoke and usually seen today for Colonial and Carlson tubes. To use it the OD for your barrel must at least .805 to .810. The best deal on installing this system is from Mike Orlen who does hundreds a year, and on a double his cost is $100 plus tubes. I would not spend the money for Brileys on your gun, but if it will take the TruChoke pattern tubes, I would consider it. Think through carefully what chokes you really need and use. For a 12, there is very little that cannot be done effectively with ic and mod unless you are serious about skeet shooting.
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