Originally Posted By LX200:
517 sits, I think, 7mm higher and is set up for 1/3 co-witness with BUIS. 517 is clearly better choice as of now.
Why does everyone like 1/3 co-witness so much?
It seems having the irons centered would be better... The whole "eye wants to center things" everyone preaches about aperture sights would come into play here, right?