I am a GP100 fan, so I will throw in my 2 cents.
I currently own 5 GP100's. Four are standard GP's and one is a Match Champion. While I am completely fine with a stock GP, I like to disassemble my GP's and polish the internals to smooth them up a bit. Having done the 4 standard GP's first, I can honestly say that Ruger did a great job on the Match Champion. Once fully disassembled, I found that most of the parts I work on were polished to a better standard than my other 4 GP's. The one area that needed attention on the Match Champion was the trigger link plunger channel. I have found that polishing this area really helps with the trigger pull. The hammer shims do more than just smooth the trigger pull, they center the hammer in the frame and prevent hammer drag. I was torn about these and almost pulled them out, but they do work and the hammer on my Match Champion has minimal drag marks compared to my other GP's.
I also recently added a Novak elevation adjustable rear sight to my Match Champion. It looks the same externally, but allows for adjustments in point of impact with different bullets weights. I don't have a lot of time on it right now, but initial impression is very positive.
Here are a couple of links to my GP posts from the past:
Novak's:
https://www.thehighroad.org/index.p...ble-sights-for-gp100-mc.914254/#post-12505612
Polishing the plunger channel and a lesson learned:
https://www.thehighroad.org/index.p...-about-the-gp-100-today.908189/#post-12356262
My GP family, minus the MC:
https://www.thehighroad.org/index.php?threads/the-gp100-family.903278/#post-12244458 -Looks like it time for an updated family photo!
I think you got a great gun that will serve you well for years to come! All of mine have been accurate, bomb proof, and a joy to shoot.
Enjoy your new GP and let us know how it shoots!