I plan on putting the PMRI configuration on an SA Loaded Model. I would love to upgrade it to a heavy contour barrel sometime. *probably in .260 but thats for another time* Could I use the heavy stock and just purchase the medium op rod block in the mean time? I've also heard of 6 and 5...

What is not clear is if heavy contour needs a different oprod guide. If I bought a Krieger heavy bbl, would it come with a proper guide?