My K31 is the most accurate rifle I own. I do not own any benchrest, varmint, or other dedicated target rifles, though. It beats the pants off my stock Remmy 700ADL & Remmy 7400.
I manage 2MOA with the issue open sights @ 100 yards, 3 rounds, issue GP11. With little effort. Oh, I have done better, but I can't do it reliably. If I sprung for a scope & mount I might, though. FWIW, I am an average rifle shot. I used to think I was a plain lousy shot, but the acquisition of my K31 put the lie to my lousiness. I have risen to the level of mediocrity. Nowadays, I even hope to be "pretty good," some day in the not too distant future.
For $100, I would buy one & some ammo, too. If you are one of the two people on the face of the earth who doesn't like it, you can unload it for more than you paid.
The surplus GP11 is worth it. It is quality ammo, not cheap corrosive fodder. Think of it as reasonably priced Federal Gold Match.
I just picked up some RCBS dies & plan on reloading after Christmas.
www.swissrifles.com is a wonderful resource.
Good luck on your decision.