I did a CZ Kevlar and turned it into a carbine. It was nice.
I rebored a M70 and that was better.
I'm telling you, the Mauser M12 Extreme (wood if you prefer) with the factory iron sights is most impressive. The detachable magazine that can easily be loaded like a standard magazine while in place is a marvel. The trigger pretty much couldn't be better as is. The bolt functions as smoothly as a Tikka. It has a shroud mounted 3 position safety. I'm all hot and bothered now...
