Yup, you'll need some parts ! At the very least, a spare cocking handle, extractor,
spring & plunger, piston & gas ring, and a few piston seals. ( And no, standard
rubber "O" rings don't last.)
As to auto-loaders ... I've owned a couple of Remington 58's, a few 1100's and an
11-87. All worked well, but my favourites were the 58's. Found the 1100's and 11-87 to be overly barrel-heavy. Really liked a Winchester Super X-1 (better than any of the Remingtons) and finally moved on to a pair of Beretta 391 Parallel Targets. Both are far more reliable than either of the various Remingtons or the Winchester. I use one for Skeet, the other (longer barrel) for Sporting Clays & occassionally Trap.