A Model 21 with a loose rib or a CSMC Fox with a crack in the stock is not worn out from number of rounds fired or from any other reason. Any of the guns mentioned will last for tens of thousands of rounds unless abused. Remember that Parker and other brands of single and double trap guns were fired tens of thousands of times with heavy 1 1/4 ounce loads before they ever got to gunsinternational.com and generally are in fine shape to shoot another century.