Optic / BUIS question

[hardhead]

I'm running a Viper PST 1-4 on one of my builds. I'm wondering if any of you have something similar mounted and if you're using back up sights. I'm not sure if I could get the proper eye relief if I moved the scope forward enough to allow a flip up sight.

I've also toyed with the idea of using a 45 degree picatinny mount for flip ups or 45 degree fixed BUIS, but I don't want to deal with the hassle of them getting in the way of a sling or other manipulations.

Opinions with explanations are welcomed. Co-witness flip ups, 45 degree fixed or 45 mounts with flip ups, or just leave it alone and run the scope by itself.

[Munny$hot]

Any magnified optic will not be a true 1x unless you go with a Elcan with switchable lenses, so trying to use your BUIS looking through the scope will not work well. The best solution would to use a quality mount that will rezero for your scope such as Bobro and standard BUIS. Offset sight are ok but IMHO if you need to take a danger close shot with a scope mounted you'd be better off with either looking down the side of your rig or using your support thumb to point and shoot vs trying to use your offset/BUIS sights.

[teflondog]

If money is no object, I'd mount an RMR on top of your scope if that's possible. You'll have a large height over bore, but you just have to remember to aim high to compensate. I think lifting your head to view the RMR is a lot faster than tilting your rifle to use offset sights. I used to have an RMR on a 45 degree mount to serve as backup to my ACOG. I moved the RMR to the top of my ACOG and I much prefer it that way.

[hardhead]

I'm looking for strictly back up. The reticle is etched so I'm not concerned about losing illumination. If the optic get damaged for some reason, I'd like to have a 2nd option.

Trying to decide between something like this: http://www.at3tactical.com/products/...sight_retarget

Or this: http://www.midwayusa.com/product/770...aluminum-matte with this: http://www.primaryarms.com/ssig-fbs-...g-fbs-r0bt-00/

[SuperSet]

I've run 45' offset sights previously but no longer run backup sights on any scoped rifles. Even if your illumination goes out, you still have your black reticle.

[mej16489]

If money is no object, I'd mount an RMR on top of your scope if that's possible. You'll have a large height over bore, but you just have to remember to aim high to compensate. I think lifting your head to view the RMR is a lot faster than tilting your rifle to use offset sights. I used to have an RMR on a 45 degree mount to serve as backup to my ACOG. I moved the RMR to the top of my ACOG and I much prefer it that way.

I'm personally the exact opposite. I find that a small rotation of the rifle to use my offset RMR is much faster and more natural then breaking my cheek-weld to look over the top of the ACOG through the RMR.