They've been out of production for decades now, so replacement parts are mostly limited to places like Numrich or Jack First.
Accessories? That's gonna be hard, beyond generic stuff that can be made to fit most any shotgun.
It was a relatively low priced shotgun while it was in production, there were a reasonable number produced, but the design is less than stellar as pumpguns go and has a couple of notorious weak spots - it tends to break its single action bar, and the stock bolt screws into an extension of the aluminum trigger plate, which tends to break off if stressed. It's not really very field strip friendly for deep cleaning/maintenance/do-it-yourself repair.
In short, there are lots more rewarding/less potentially frustrating pumpguns out there to choose as "project guns." Lots of us here frequently suggest popular, current production pumpguns like Remington 870s or Mossberg 500s with boring regularity for several reasons, most of which tend to be the exact opposite of the list I just ran through above.
That said, I hope you got one of the ones that will run for a lifetime plus without breaking anything or giving you any trouble, and I hope you can make it into whatever you want it to be as a project.
lpl
