Another 500, so that in fifty years from now when your current one dies cause an elephant stepped on it or a tank drove over it... you can replace it (<real comedian huh?)
Maybe keep a set of a cartridge stop and interrupter in case one gets bent... Front bead as they do go flying off some times... Magazine spring? I'm not sure much really breaks on 500's due to wear...
I plan on shooting trap, skeet, sporting clays with my Mossy 500 so parts will get a workout. Just was not sure if a few Mossy 500 parts will tend to wear faster.
How many rounds has this LTB45 shot using a Mossy 500?