Optical phoria is a condition that exists when normal binocular vision is interrupted - your eyes move slightly independent of each other. The Armson OEG, famously seen mounted on a MACV-SOG rifle during the failed Son Tay prison rescue in 1970, worked in a similar way though the Armson OEG itself couldn’t be seen through.Īs you may anticipate, there can be some issues. The idea is that if you have a bright enough reticle and keep both eyes open, your brain will superimpose the reticle your dominant eye is viewing onto your non-dominant eye. Just as with a Trijicon ACOG, you can use what’s called the Bindon Aiming Concept or occluded eye shooting for up-close work. Though prismatics, in general, have been used for decades with both eyes open, it can take a lot of practice. Like previous models, there’s a removable Picatinny top rail on the SLx if you want to piggyback an MRDS or similar for up-close use. For the 3x, you can choose between the ACSS-5.56 CQB M2 or the ACSS-CQB 300BLK/7.62×39. The SLx Gen III 5x is available with the ACSS 5.56/5.45/.308 and also the ACSS Aurora, which was only previously available on special models of the Trijicon ACOG. What’s paramount with any BDC is to go out and test/track your own rifle and load at range with the reticle itself. While we’re not huge fans of the BDC in most circumstances, you can still make use of those stadia with a little planning (see “No True Zero” in RECOIL Issue 35 for more details). Primary Arms is known for their ACSS bullet-drop compensator (BDC) reticles, so we were unsurprised to see the same in these. 308 from the notorious optic-killer SCAR 17s. In terms of durability, Primary Arms tells us they each survived in excess of 6,000 rounds of.
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