11-87P is good to go as is(my god, I said good to go). I wouldnt mess with it out of the box. If I were you, I'd go out and put 1,000+ rounds down range, and then decide if you NEED and extra work. What you NEED and what you WANT are to whole nuther' somethins'. Need is always practical. Want doesnt do much for you.
After 1K rounds, I decided I NEEDED an extended factory loading gate, like the ones that come on new P models, for faster reloads. I got it. I WANTED rifle sights on my 11-87SP and got them, but after that 1K mark I decided they werent what I NEEDED to get the job done. Samething apples fot the side saddle, and SpeedFeed ammo bearing stock. I dont NEED them, but I WANTED them.
Dont just send it off to let some gunsmith do whatever, decide for yourself.