Re: 20 moa rail question
It might. Depends on the gun and rings you are already using. I run NF low rings with a 20 moa base, and there is barely any room to put on the bikini cap.
It is usually beneficial to run a 20 moa base, but make sure it will not cause your scope to hit the barrel. Get your base and then go buy your rings if you can.
Good Luck