Now that Deep River has suddenly decided to allow sub gauge tubes for small bore events, I'm thinking about getting some for a featherweight 12. I already have a set of 28s that work and am thinking about getting a set of 20s. Since it's for sporting clays and not skeet has anybody patterned a set of Briley sidekicks? Alternatively if a set of companion tubes will work in one LC Smith will they generally fit others with the same barrel lengths?