Re: 2-piece or 1-peice scope base
Yes if you have an open action like a remington or a Sako and want to keep a big open ejection port so you easaly can load the gun from above.
There is also height spared by using separate rings.
But if you have a long base above it, I have a and the last mm not is that important an unimount is to be prefered in my opinion.
Håkan