The Osight lineup includes products with LOTS of similair names, but trust us, they are all very different. Some are RMSc-footprint optics for slim and compact pistols, while others use larger RMR-style footprints for full-size handgun setups. Some models use enclosed emitters for added protection against ingress, whilst others use open-reflex designs for a lighter profile and wider viewing window.
This guide compares the main models in their lineup, including the SE, S, K, C, X, and XR, so you can understand the differences in footprint, emitter style, reticle options, and battery setup.
For the full lineup, browse our Osight offerings. For the enclosed RMSc models specifically, see our Osight SE Collection.
Quick Osight Model Comparison
| Model | Footprint | Emitter | Reticle | Best Fit |
|---|---|---|---|---|
| Osight SE | RMSc | Enclosed | 2 MOA dot / 32 MOA circle or 6 MOA dot, depending on model | Slim and compact pistols where an enclosed emitter is preferred |
| Osight S | RMSc | Enclosed | 2 MOA dot and 32 MOA circle | Compact pistol setups with rechargeable optic preference |
| Osight K | RMSc | Open | 6 MOA red dot | Simple carry optic with a larger, fast-to-pick-up aiming point |
| Osight C | 407c / 507c-style footprint | Open | 3 MOA dot and 32 MOA circle | Larger open-reflex setup with red or green reticle options |
| Osight X | 407c / 507c-style footprint | Open | 3 MOA dot and 32 MOA circle | Larger-window open-reflex setup with rechargeable battery design |
| Osight XR | RMR | Enclosed | 2 MOA dot, 6 MOA dot, 32 MOA circle, or combinations | Rugged enclosed-emitter setup for larger pistol platforms |
Osight SE
The Osight SE line is a compact enclosed red dot option built around the RMSc footprint. It is a strong starting point for slim and compact pistols where you want the added protection of an enclosed emitter.
SE models are available in red and green reticle options, including 2 MOA dot with 32 MOA circle configurations and 6 MOA dot versions. That gives the SE line more flexibility than a single-reticle carry optic while keeping the size appropriate for compact handgun setups.
If you are comparing SE variants, start with the Osight SE collection. Current SE options include the Osight SE Enclosed RMSc Red Dot Sight, 2 MOA Dot & 32 MOA Circle, the Osight SE Enclosed RMSc Green Dot Sight, 6 MOA Dot, and the Osight SE Enclosed RMSc Green Dot Sight, 2 MOA Dot & 32 MOA Circle.
Osight S
The Osight S is another enclosed RMSc-footprint option, but it is positioned differently than the SE line. It uses an enclosed emitter, compact window, rechargeable battery setup, motion sensor activation, and a 2 MOA dot with 32 MOA circle reticle system.
For shooters comparing compact enclosed Osight models, the S makes the most sense if you want an RMSc-footprint enclosed sight with a rechargeable setup. The SE line is better if you want more variant choices, especially red or green reticle options and different dot-size configurations.
See the Osight S Enclosed RMSc Red Dot Sight, 2 MOA Dot & 32 MOA Circle.
Osight K
The Osight K is the simpler carry-focused option in the lineup. It uses an RMSc footprint, open-emitter design, and a 6 MOA red dot. That larger dot is designed for fast pickup, which can be useful on compact and subcompact pistols.
Compared to the SE and S, the K gives up the enclosed-emitter housing. In return, it keeps the design straightforward, compact, and lightweight. If you want the most protected RMSc option, look at the SE or S. If you want a simple open red dot with a bold aiming point, the K is the cleaner comparison.
See the Osight K Open RMSc Red Dot Sight, 6 MOA Dot.
Osight C
The Osight C moves into the larger open-reflex side of the lineup. Instead of the RMSc footprint used by the SE, S, and K, the C uses a 407c / 507c-style footprint, which is commonly associated with larger pistol optic setups.
The C models use a 3 MOA dot and 32 MOA circle reticle system, with red and green reticle versions available. The open design provides a wide viewing window and a familiar layout for shooters using full-size or compact pistols with larger optic cuts or adapter plates.
Current C options include the Osight C Open Red Dot Sight, 3 MOA Dot & 32 MOA Circle and the Osight C Open Green Dot Sight, 3 MOA Dot & 32 MOA Circle.
Osight X
The Osight X is another open-reflex model using a 407c / 507c-style footprint. It is a better fit for shoppers who want a larger-window open optic with a rechargeable battery design and a 3 MOA dot with 32 MOA circle reticle system.
Compared to the C, the X still sits in the larger open-reflex category, but the product line leans more heavily into the rechargeable design. If you are comparing C and X, the decision usually comes down to window preference, battery preference, reticle color, and the exact pistol setup you plan to mount it on.
Current X options include the Osight X Open RMR Red Dot Sight, 3 MOA Dot & 32 MOA Circle and the Osight X Open RMR Green Dot Sight, 3 MOA Dot & 32 MOA Circle.
Osight XR
The Osight XR is the more rugged enclosed option in the larger-footprint side of the lineup. It uses an RMR footprint, enclosed emitter, rechargeable battery system, and multi-reticle setup with 2 MOA dot, 6 MOA dot, 32 MOA circle, and combination reticle options.
If the SE is the compact enclosed RMSc choice, the XR is the enclosed option for shooters who want a larger RMR-footprint sight. It is a better match for full-size pistols, duty-style setups, or users who want the added protection of an enclosed emitter without staying in the smaller RMSc footprint category.
See the Osight XR Enclosed RMR Red Dot Sight, 2/6 MOA Dot & 32 MOA Circle.
Which Model Should You Choose?
The easiest way to choose an Osight red dot is to start with footprint and intended use.
Choose the Osight SE if you want an enclosed RMSc-footprint optic with multiple red and green reticle options.
Choose the Osight S if you want a compact enclosed RMSc optic with a rechargeable design.
Choose the Osight K if you want a simple open RMSc carry optic with a bold 6 MOA red dot.
Choose the Osight C if you want an open 407c / 507c-style optic with red or green circle-dot options.
Choose the Osight X if you want a larger open-reflex optic with rechargeable battery design.
Choose the Osight XR if you want an enclosed RMR-footprint optic with a rugged housing and flexible reticle system.
RMSc vs RMR: The Biggest Fitment Difference
The most important practical difference between these models is footprint. The SE, S, and K are RMSc-footprint optics, which generally makes them better candidates for slim and compact optics-ready pistols. The C, X, XR, and standard RMR green dot models belong on the larger-footprint side of the lineup.
Always confirm your handgun’s optic cut, plate system, screw pattern, and manufacturer compatibility before ordering.
Final Thoughts
The Osight lineup makes more sense when you separate the models by footprint and emitter style. The SE, S, and K are the compact RMSc-focused options. The C and X are open-reflex models for larger optic setups, and the XR is the enclosed RMR-footprint option for shooters who want more emitter protection in a larger platform.
If you are comparing every model, start with the full Osight optics lineup. If you already know you want a compact enclosed RMSc model, go straight to the Osight SE Collection.
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