Olight Osight K Green vs Red — Is Green the Astigmatism Fix?

A while back I put the Osight K on my X-Macro and told you it wasn't coming off. Then Olight made it green: $10 more, same optic, different emitter, and that $10 is supposed to buy you a dot your eye picks up faster — especially if you've got an astigmatism. This time it's not going on a micro compact. It's going on the new Bersa 2011. Full transparency: I have a relationship with Olight and they sent this one out. Nothing changes how I feel about it; if it's junk I'll tell you it's junk, and Olight already knows I'll say it.

Why this gun? Bersa cut the slide for the Holosun K footprint — a modified RMSc — so the Osight K drops straight on with no adapter plate, and the cut is deep enough to co-witness with the tritium front sight and raised rear. I hadn't put any of the RMSc-footprint Osights on something I could co-witness, so this was the chance. Full Bersa review coming; I have a lot to say about it.

Spec sheet: 6 MOA green dot, 21 by 14mm window, 7075 aluminum housing, IPX6, and it weighs one ounce, which is about as much as nothing. Eight daylight settings, two night-vision settings, and the RMSc footprint fits a P365, 43X, 48 MOS, Hellcat, Shield Plus — whatever you're carrying. The CR1620 battery loads from the side: pop the tray, swap it, done, no pulling the optic and re-zeroing. Motion sensor wakes it, it sleeps after about three minutes, and when voltage drops to around 2.2V the dot triple-flashes once a minute to tell you to change the battery. The 75,000-hour claim is a lab number on the lowest setting; if you carry the gun, check the optic every morning, and if it's a safe queen, every six months to a year.

Nobody talks about this enough: Olight's packaging is best in class. If I had a nickel for every battery-door screw I've lost, I'd be a rich man. The box has a myriad of mounting screws — 6-32, 6-40, M3, 4-40 — plus the tool and the cloth. I've mounted other companies' optics with Olight screws because the other guys don't give you what you need.

So why green? Your eye is more sensitive to green light, so at the same power level a green dot looks brighter and jumps out faster against dark targets and cluttered light. The trade-off: it pulls a little more juice and costs about $10 more. Then there's astigmatism — I've got it, had it laser-corrected, and some optics still smear on me. The red K never did, and this one didn't starburst at all either. And yes, a 6 MOA dot on a 2011 is a real trade-off: on the X-Macro it makes total sense, but the Bersa can reach out past 25 and 50 yards, and a big dot starts covering what you're shooting at.

Range time, and one honest miss: this one was not close out of the box. I was about eight inches low, dialed roughly 20 clicks, and was still low before I got it in — every other Osight I've mounted was close enough to hit steel and not be embarrassed. Once it was zeroed the clicks were clean and tactile, elevation on top, windage on the side, countable in the dark. Green on white paper looked fantastic.

Back from the range: green does read brighter at the same setting in the same light, and it's the dot my eye goes to first. Not night and day, but real, and I noticed it most in that first hundredth of a second on presentation. The flip side: against a bright green berm or foliage, red wins because nothing else out there is red. Green isn't better — it's better at more of the things most of us actually shoot at. Clear window, no parallax, no blueing, zero starburst for me. If your red dots turn into a comet, this is the cheapest fix you're going to find that isn't laser surgery.

On the 6 MOA question: at 25 yards on steel or paper you're pointing more than aiming, and that's what you want. Push it out and the dot eats the target. If the Bersa is your range gun, fun gun, and bump-in-the-night gun, 6 MOA is right. If you bought a 5-inch 2011 to shoot tiny groups at distance, get a 3 or 1 MOA dot — that's not the K's fault, that's the wrong tool. What I didn't expect is how well the pairing works: the steel frame soaks up recoil, the dot lifts a hair and comes right back, and it's the best dot tracking I've had out of a K, because every other K I own is on a much smaller gun. The co-witness on the Bersa is legit, so if the optic ever went down I'm not out of the fight.

One caveat that matters more on a carry gun: this is an open emitter. The Bersa isn't going in my waistband, so I'm not worried about belly lint, but if you put a K on a carry gun — which is what this footprint is for — be deliberate about cleaning it out. That's still why my enclosed Osight SE lives on my Canik Prime. Motion wake has been flawless. About $169 for the green versus roughly $159 for the red; on a gun cut for it from the factory, it's about as easy a yes as I can give you. Astigmatism crowd, tell me in the comments whether green fixed it for you.