I have a model 21 duck I bought in '84 with the $$ I saved by quiting smoking two $1 a day packs of cigarettes. It was to be the end all duck gun. When steel was mandated I foolishly had it opened to ic mod to handle steel. Two shots was not enough so I I went to a BPS. ( I did not alter my 3" model12) what is done is done and since I can never sell the gun since it probably saved my life by making me stay off the fags. What do I do with it now? Hate to just leave it in the safe for the remainder of my life, so I occasionally think about having flush tubes installed. What say yea?