First, here's a little background that prompted the question:
I'm building what I will call a CAR-10T. Don't ask me why because I'll never give you a straight answer. In short, the rifle would be intended for close quarters use with maybe a few outside shots.
Basically, the rifle is what it sounds like:
Top End: An AR-10(T) carbine top end with an A.R.M.S. S.I.R. System (with the fixings), a JP Recoil Eliminator, a Laser Devices MR-2, Elcan, etc.
Lower Receiver: Eagle Arms lower with the ArmaLite two-stage trigger, a Rock River Arms Entry Tactical Stock with a KMC Stock Extension Sling Mount, a custom buffer (154 grams, 2.5”), and an SR-25 Op Spring (modified to 29 coils).
Optics and sights remains an unresolved issue. Currently I have an Elcan on the upper with plans to use an A.R.M.S. #40 flip-up rear sight. I can’t for the life of me decide what front sight to use: A Bushmaster flip-up (with .040 blade), a fixed A2 sight (with .040 blade), or something else entirely.
The question is: How important is the co-witnessing of optics? Do I want to trade down to an EOTech (1 MOA dot) that will allow me to co-witness my backup sights and my primary sight? Or do I keep the Elcan and use the back-up sights as back-up sights?
Such a dilemma, please help me!