I've got one of the older 527's in 223. 1-12 barrel and Leupold 2-7. I'm using a set of Tikka rings, knock out the pin and they fit the CZ bases perfect. The original bolt just clears the scope. I was unable to get a decent trigger pull with the two stage trigger on this one and ended up with a very clean 2.5 lb single stage. As others mentioned mine really likes the 40 gr V-Max, works well with 27 gr (max book load). of Ramshot X-terminator.
I got a James Calhoon single shot adapter for it and use it as a single shot as often as with the magazine. I hesitated on that at first as it's not cheap at $60 but don't regret it now. It's a quality piece of machined steel that fits and works perfect.
