I love these comparison and thinking 
(1) Red Dot vs Fiber Sight

I estimate my eye has 0.25" - 1.0" / 25yard blur, depends on brightness -> pupil -> depth of focus.
In outdoor sunny condition, about 0.25" / 25yd = 1MOA
(2) P226 Legion vs P226-MK25-CA + Bar-Sto
regular P226 Bar-Sto Fiber Sight can do 2"/25 or less.
Photo, P226 Legion RX 17 yard Hornady XTP90 = 1.1"/50ft = about 1.8" / 25 (with RDS)
So accuracy ranking will be...
P226 + Bar-Sto Match Fit > P226 Legion = P226 + bar-Sto Drop In > regular P226
I believe regular P226 + Bar-Sto + Red Dot milling can achieve same level accuracy as Legion.
But it's too expensive and destructive, sell current slide + buy Legion upper is the way to go.

(1) Red Dot vs Fiber Sight

I estimate my eye has 0.25" - 1.0" / 25yard blur, depends on brightness -> pupil -> depth of focus.
In outdoor sunny condition, about 0.25" / 25yd = 1MOA
(2) P226 Legion vs P226-MK25-CA + Bar-Sto
regular P226 Bar-Sto Fiber Sight can do 2"/25 or less.
Photo, P226 Legion RX 17 yard Hornady XTP90 = 1.1"/50ft = about 1.8" / 25 (with RDS)
So accuracy ranking will be...
P226 + Bar-Sto Match Fit > P226 Legion = P226 + bar-Sto Drop In > regular P226
I believe regular P226 + Bar-Sto + Red Dot milling can achieve same level accuracy as Legion.
But it's too expensive and destructive, sell current slide + buy Legion upper is the way to go.
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