If you are looking for a tactical optic to put on top of a rifle that needs to be accurate after being drug through the mud...
SWFA 10x gets my vote. Unless the rifle is a 300 Win Mag or larger, then go with the 12x. The 16x doesn't get very good reviews, better to try to find a used IOR 16x.
Any quality rings and base will work, the ones you listed will never give you any trouble as long as you torque them tight with a dab of blue threadlocker.
Machine guns are awesome until you have to carry one.