Rifle Scopes US Optics MR-10 vs. B10

Just picked up the MR-10 and see the B-10 is $600. What is the difference given they are both the same in magnification, etc.

No first hand experience but some of the major differences are the turrets, scope body diameter, and glass. Several people I know who have B17's claim the glass is substantially better then the old 3.2-17's. Heard it's on par with Khales and ATACR F1 series, but glass is very subjective.