Looking for a Purbaugh or similar conversion of a Std. weight Remington 1100 20 gauge to 28 gauge. I am also interested in what some referred to as an over-barrel. This is where they place thin wall hydraulic tubing on a plain 410 or 28 gauge barrel small frame gun and then have Simmons put a rib on it. This set up does not require any modification of the internals. These type of guns where very popular before the days of briley and kolar tubes.