Can't comment on the standard vs. low pro bases but I will say this: if you're going to go with one of his bases, I would go with his rings as well... the bases are machined to be a little bit higher than others (for better case ejection) while his rings are machined a little bit lower than others to compensate for the difference in height.
I have a standard 20 MOA base on my 110 FCP with low height rings and there's not much clearance between the top of my barrel and bottom of my shade (50mm). Barrel is at the smith getting threaded right now, otherwise I would take some pictures for you.
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