[Dan S]

Nothing wrong with lapping...

a bolt. All high end rifles have hand lapped bolts. I also used JB's and then Flitz. The bolt really shines after being polished with Flitz.

Lapping the bolt provides more of a controlled wear situation. Using a compound has benefits over manually breaking in two surfaces.

 

[Dan S]

Its not that difficult and...

when you clean the bolt/reciever all the metal debris will be cleaned off. CZ's recievers have machining ridges that are like a washboard surface.

Dwight is right about galling. JB's is an oil based compound that will polish both surfaces without galling by acting like a buffer between the two surfaces. The compound emulsifies while collecting the metal particles.