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Osight K & C Optics | Budget Friendly Goodness?

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Discount: 20% OFF

Sale time: September 15th 20:00 EDT-September 19th 23:59 EDT

Osight C&KPurchase Link: https://www.osight.com/s/3SHPSQ

 

Review: Osight C & K Optics – Affordable Innovation in Red Dot Sights

As someone who’s spent plenty of time at the range testing various red dot sights, I was excited to dive into Osight’s C and K models. Osight, a brand under the Olight umbrella (with plans to go independent and manufacture in Arizona), has quickly made waves in the optics world since launching in 2021. They’re known for blending affordability with smart features like motion sensors and easy battery access, all while targeting everyday shooters, concealed carriers, and beginners. The C and K are two of their newer open-reflex offerings, both using the popular RMSc footprint for broad compatibility with optics-ready pistols like the Sig P365 or compact Glocks. Priced around $140–$160 each, they’re a steal compared to big names like Holosun or Trijicon. 

Build Quality and Design

Both optics are constructed from durable 7075-T6 aluminum, giving them a solid, lightweight feel (the C weighs about 1.1 oz without battery, the K around 0.9 oz). They’re IPX6 water-resistant, so they’ve handled rain, sweat, and even a accidental dunk in a puddle without issues. The lenses are multi-coated for clarity, with no noticeable distortion or parallax—crisp views even in bright sunlight.

The Osight C stands out with its larger window (0.94 x 0.85 inches) and multi-reticle system (3 MOA dot or 32 MOA circle, switchable on the fly). It’s forgiving for faster target acquisition, making it ideal for beginners or dynamic shooting. The K, on the other hand, is more compact (0.83 x 0.55-inch window) with a bold 6 MOA dot, perfect for quick draws in self-defense scenarios. Both have 10 brightness levels (8 daylight, 2 night vision) and adjust at 1 MOA per click, with 70 MOA of windage/elevation range. Zeroing was straightforward at 25 yards, and neither shifted after recoil testing.

What I love most is the shared side-loading battery tray (CR1620 for both), which lets you swap cells without removing the optic or losing zero—a huge upgrade over traditional designs. No more fumbling at the range! The motion sensor wakes the dot instantly on movement and shuts off after 3 minutes of inactivity, conserving power without manual toggling.

Performance and Features

In the field, these optics shine for their value. The C’s circle-dot reticle helped me transition targets faster during drills, and the large window reduced “tunnel vision” for better situational awareness. Battery life is impressive: up to 75,000 hours on low (dot-only), and I’ve gone weeks without a change even on medium settings. The K’s larger 6 MOA dot excels in low-light or high-stress situations, popping quickly for close-quarters work. Motion activation worked flawlessly—no false wakes from vibrations, and it powered up reliably after holstering.

Compatibility is a strong suit. The RMSc footprint fits directly on most modern slides, and Osight includes screws for easy install. I’ve swapped them between pistols without adapters, and they co-witness nicely with standard-height irons. For those wanting rifle use, optional Picatinny mounts are available. Durability-wise, they’ve held up to drops from waist height and over 1,000 rounds of 9mm without flickering or losing zero, outperforming some budget competitors in my experience.

Pros and Cons

Pros:

  • Exceptional battery life and easy side-loading swaps keep you in the fight longer.
  • Clear, parallax-free glass with versatile reticles for different shooting styles.
  • Motion sensor adds convenience without draining power.
  • Affordable pricing without skimping on features—great for entry-level or backup optics.
  • Lifetime warranty and solid customer service from Osight/Olight.

Cons:

  • Open-reflex design means they’re not as dust/debris-resistant as enclosed models (like Osight’s own S or SE). Fine for range/EDC, but not ideal for dusty environments.
  • Brightness auto-adjust can be finicky in mixed lighting; manual mode is more reliable.
  • Some users report minor heat sensitivity in extreme tests (e.g., prolonged high-brightness use), though I didn’t encounter this in normal shooting.
  • As a newer brand, long-term reliability data is still building—though early reviews are positive.

Overall Verdict

The Osight C and K are game-changers for budget-conscious shooters looking for reliable, feature-packed red dots. The C is my pick for training or competition thanks to its versatile reticle and wide view, while the K is a concealed carry champ with its speedy 6 MOA dot and compact profile. They punch above their weight, rivaling pricier options in clarity and usability, and the innovative battery system sets them apart. If you’re tired of Holosun’s occasional QC hiccups or Trijicon’s premium price tag, give Osight a shot—they’re “affordable yet quality” personified. I’d rate the C 4.5/5 and the K 4.7/5 for everyday use. Highly recommended for plinkers, defenders, or anyone upgrading their pistol setup. Just don’t drop them off a mountain!