I own two sets of tubes; an older set of unmarked 28 gauge tubes that came in a 16 ga DH that I purchased and has a separate extractor which must be installed with the tubes. They will only fit this gun, having been tried in several barrels. I also have a pair of like new 28 ga Briley's that came with a nice high quality English boxblock with Damascus barrels. They must have been installed due to the Dasmacus barrels but there was absolutely nothing wrong with the barrels (they were perfect). These (for a12 ga) don't want to fit anything else either. These guns are both 2-1/2" chambers. I suspect that Briley's off the shelf will not fit any short chamber gun. This is the same thing that limits the usefulness of chamber inserts.
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