Re: Do I need a 20 MOA base?
The only way I see that it could maybe hinder you, would be if the scope doesn't have enough elevation in it to use the reticle like it's designed to be used (assuming you want to use it for holdover out to X distance).
This is probably very unlikely, but I see it as a possibility. A 20 moa base will mean that you'll have to crank the reticle up further to sight in at the desired bar/dot, whatever.............most likely, it wont be an issue.
Only other downside I know of is possibly having to use slightly taller rings when mounting the scope, because the objective bell will be closer to the barrel with a 20 minute rail............really depends on how heavy and thick the barrel is though. Most likely, this wont matter either.
Aim small = Miss small