NEA Co-witness rail and Vortex Sparc on a CZ-858

rdelliott

rdelliott

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So I've been looking at sticking a red dot on my 858, and have about settled on the combination of the NEA upper handguard and a Vortex SPARC. I like the relatively low profile and ability to co-witness.

Have any of you running this combaination experienced any issues or difficulties? I am aware that the doubler on the SPARC will not fit, but other than that, any fried/failed optics or other problems?
 
As to show here what your sight picture will look like;
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This is what Stevo on the Milsurp forum had to say;
Yes, it's tritium, a new product from NEA. My rear sight is unmodified. I'll probably get the NEA tritium rear when it comes out but my iron sights are just back-up to my RDS.

I replaced the Aimpoint on my CSA Carbine with another Bushnell TRS-25 so I can co-witness. It gives a bottom 1/3 if you want to line them up.
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rdelliott said:
Any particular reason why? What are the notable differences?
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The biggest reason was that in order to co-witness I needed to set the rear at 3 or 400m and adjust the front sight for a single distance iron sight zero. I like to retain the functionality of the rear sight. If that doesn't matter to you, the Sparc is fine.

The dot emitter in the Sparc is on the bottom, it's on the side on the TRS-25. That's why it's not as easy to use the irons.
 
And make sure you have a low sitting rear butt stock adapter(not the NEA cantilever adapter) as it will create eye relief issues. As that is an issue that I encountered, not knowing any better and wanting to run buis(i didnt bother in the end).
 
JAGDMORDER said:
And make sure you have a low sitting rear butt stock adapter(not the NEA cantilever adapter) as it will create eye relief issues. As that is an issue that I encountered, not knowing any better and wanting to run buis(i didnt bother in the end).
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Can you elaborate on your eye relief issues? Do you mean a rear BUIS was unusable on the NEA cantilever mount or NEA railed stock adapter for you?
 
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Current rig:


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With the aimpoint mounted low on the Nea upper handguard, and the high posture of the Nea cantilever rear butt mount, it creates an uncomfortable sight picture. I will have to get the regular style rear stock adapter to drop it down a bit, or raise up the aimpoint losing co-witness to solve my particular problem. I will perform the former to make the fix(I just need to find a regular lower adapter somwhere that takes PMO's)lol. Hope that helps.
 
JAGDMORDER said:
Current rig:


Uploaded with ImageShack.us

With the aimpoint mounted low on the Nea upper handguard, and the high posture of the Nea cantilever rear butt mount, it creates an uncomfortable sight picture. I will have to get the regular style rear stock adapter to drop it down a bit, or raise up the aimpoint losing co-witness to solve my particular problem. I will perform the former to make the fix(I just need to find a regular lower adapter somwhere that takes PMO's)lol. Hope that helps.
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Ah okay I see. You could also just ditch the factory sights and mount BUIS on the stock adapter and barrel clamp rail if you go with a taller micro mount, no?
 
Mambo said:
Ah okay I see. You could also just ditch the factory sights and mount BUIS on the stock adapter and barrel clamp rail if you go with a taller micro mount, no?
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I tried that and no it doesn't work. The rear stock adaptor rail higher than there rail. Although there rear stock adaptor rail and the B.C. Tactical rail did work for me when using AR15 BUIS. After I used this set-up I came to the conclusion that K.I.S.S. (Keep It Simple Stupid) worked best for me and I ditched the BUIS.
 
Stevo said:
The biggest reason was that in order to co-witness I needed to set the rear at 3 or 400m and adjust the front sight for a single distance iron sight zero. I like to retain the functionality of the rear sight. If that doesn't matter to you, the Sparc is fine.

The dot emitter in the Sparc is on the bottom, it's on the side on the TRS-25. That's why it's not as easy to use the irons.
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So if I understand correctly, in order to co-witness with the SPARC you need to adjust the front sight post so that a rear sight setting of 400 is shooting to point of aim at 100, whereas with the Bushnell you can have it cowitness without jacking up the iron sights?
 
rdelliott said:
So if I understand correctly, in order to co-witness with the SPARC you need to adjust the front sight post so that a rear sight setting of 400 is shooting to point of aim at 100, whereas with the Bushnell you can have it cowitness without jacking up the iron sights?
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Correct. Or whatever distance you want to zero it at.

With the Bushnell, the iron sights are visible and usable throughout their entire range with no need to adjust them.
 
Satain said:
I tried that and no it doesn't work. The rear stock adaptor rail higher than there rail. Although there rear stock adaptor rail and the B.C. Tactical rail did work for me when using AR15 BUIS. After I used this set-up I came to the conclusion that K.I.S.S. (Keep It Simple Stupid) worked best for me and I ditched the BUIS.
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Hey Satain I think you misunderstood me. I suggested mounting the rear BUIS on the NEA railed stock adapter (with the tiny rail), NOT the NEA cantilever mount. That for sure is level with NEA upper hg and barrel clamp rail as I've run that config.
 
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