The Glock 43X/48 pistols have become popular choices for concealed carry thanks to their slim profile, manageable size, and comfortable everyday-carry design. If you’re looking to add an Osight red dot to either pistol, the biggest thing to get right is optic fitment.
In this guide, we’ll break down which Osight optics fit the Glock 43X/48 and what you need to know about footprints and the need for any adapter plates. We’ll also compare the compatible Osight options so you can choose the optic that makes the most sense for your setup.
Which Glock models does this apply to?
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Glock 43X/48 MOS |
Glock 43X MOS and Glock 48 MOS models with the standard Slimline MOS optic cut. |
Which Osight optics do we recommend for the Glock 43X/48?
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RMSc |
Why Consider an Osight Red Dot?
Osight has made a name for itself by offering pistol red dots without pushing the price into premium-optic territory. If you want to add a red dot to your Glock 43X/48, Osight offers several RMSc-footprint options including both open and enclosed emitter designs.
They've also been pretty willing to try things that are a little different. Depending on the model, you'll see features like rechargeable optics with magnetic charging covers, different reticle options, and even newer housing materials like OAL.
Osight is a good option if you want an optic at a more approachable price, whether it's going on a carry gun, range gun, or you're just getting into pistol red dots for the first time.
What Optics Footprint Is the Glock 43X/48?
The Glock 43X MOS and Glock 48 MOS have a Glock Slimline MOS cut, which is literally just a RMSc footprint. That means to mount a red dot you need to choose an optic that uses the RMSc footprint as well.
What Adapter Plates Exist for the Glock 43X/48?
One nice thing about the compatible Osight models is that they use a true RMSc footprint, so you won’t need an adapter plate to mount them to a Glock 43X MOS or Glock 48 MOS. That keeps the setup simple and also saves you the extra cost of buying an adapter plate.
This is a little different from optics like the Holosun K-series, which use a modified RMSc-style footprint and typically require an adapter plate for the factory Glock slimline MOS cut.
Best RMSc-Footprint Osight Optics for the Glock 43X/48
1. Osight SE Red & Green Dot - Direct Fit RMSc Enclosed Carry Dot
Buy the Osight SE At The Best Price
The Osight SE is a compact enclosed-emitter pistol optic designed for everyday carry, concealed carry, home protection, and defensive use. Its fully enclosed design protects the emitter from dirt, moisture, lint, and debris, helping the optic remain dependable in harsh conditions or during daily carry.
Unlike Osight models that use a magnetic charging cover, the Osight SE is powered by a side-loading CR1620 battery. This allows the battery to be replaced without removing the optic or disturbing your zero. Battery life is rated for up to 75,000 hours at brightness setting three.
The Osight SE is available with either a 6 MOA dot or a multi-reticle system featuring a 2 MOA dot and 32 MOA circle. Both reticle options are offered in red or green. The optic also includes eight daylight brightness settings and two night vision settings.
Its housing is made from durable 7075 aluminum, while the aspherical lens is designed to provide a clear, distortion-free sight picture. The optic uses the compact RMSc footprint and weighs just 0.97 ounces, making it a strong option for slimline and concealed-carry pistols.
Who is it for? The Osight SE is best for shooters who want a compact, enclosed optic with replaceable batteries, multiple reticle choices, and strong protection against the debris and moisture commonly encountered during everyday carry.
2. Osight S Red Dot - Enclosed RMSc Optic with Rechargeable Battery
Buy the Osight S At The Best Price
The Osight S is a compact enclosed-emitter pistol optic designed for those who want the added protection of an enclosed design combined with a rechargeable power system. It is very similar in size and overall design to the Osight SE, but instead of using a replaceable side-loading battery, the Osight S is recharged using Olight’s magnetic charging cover.
The charging cover features an integrated battery display that shows the remaining battery level of both the optic and the cover. A fully charged cover can recharge the optic approximately three times before the cover itself needs to be plugged in. The optic provides up to 21,900 hours of runtime at brightness level three while using the 2 MOA dot only.
The Osight S is available exclusively with a red multi-reticle system. You can switch between a 2 MOA dot with a 32 MOA circle, the 2 MOA dot by itself, or the 32 MOA circle by itself. It also includes ten daylight brightness settings and two night vision settings.
The housing is constructed from Olight’s OAL material, which the company claims is 19% harder than 7075 aluminum and offers strength comparable to titanium while maintaining a lightweight design. The optic weighs just 0.97 ounces.
Who is it for? The Osight S is best for those who want a compact enclosed optic with a rechargeable battery system and do not want to purchase or replace disposable batteries.
3. Osight K - Best Budget RMSc Red Dot
Buy the Osight K At The Best Price
The Osight K is a compact open-emitter pistol optic designed as the most budget-friendly option in Osight’s RMSc-footprint lineup. It shares the same general size and window dimensions as the enclosed Osight SE, but its open-emitter construction keeps the design simple and affordable.
The Osight K is available with a 6 MOA dot in either red or green. The larger dot is easy to locate during the draw and works especially well for close-range shooting, concealed carry, and defensive use. It includes eight daylight brightness settings and two night vision settings.
Power comes from a side-loading CR1620 battery. Runtime is rated for up to 63,000 hours at brightness level three. A motion sensor automatically activates the optic when movement is detected and powers it down after three minutes of inactivity to conserve battery.
The housing is constructed from 7075 aluminum and weighs 1.02 ounces, features a 0.83 × 0.55-inch window, and carries an IPX6 water-resistance rating.
Who is it for? The Osight K is best for shooters who want an affordable, lightweight RMSc optic with a simple 6 MOA dot and easy side-loading battery access. It is a strong entry-level choice for concealed-carry pistols, range guns, and anyone who does not need the added protection of an enclosed emitter.
Choosing between Red or Green Reticles
It’s common to go back and forth between red and green reticles, so here are a few practical points to help you decide which one makes the most sense for your setup.
- Green reticles are often easier on the eyes, especially during longer range sessions or extended training.
- Shooters with astigmatism sometimes see a cleaner dot in green. While results vary from person to person, many customers report that a green reticle appears more defined and less “smeared” compared to red.
- Green will not wash out on backdrops like green grass, foliage, or green colors.
- In theory, green dots can have a longer battery life because green is brighter, so for example a green dot on brightness setting 6 may be the same brightness as a red dot on setting 7 - which would save battery life.
If you want to learn more check out our full article about Red vs Green Dot Pros & Cons here.
Choosing between Open vs Closed Emitters
A simple way to think about open versus enclosed emitter red dots is to match the optic to how you plan to run your Glock 43X/48.
If your Glock 43X/48 is going to see a lot of outdoor use in rain, snow, or rough conditions, an enclosed emitter has a clear advantage. The emitter is sealed inside the housing, which helps prevent water, dirt, or debris from blocking the dot when conditions are less than ideal.
For shooters running OWB setups, whether for duty, range time, or general outdoor use, enclosed optics tend to be the safer choice for that added protection and consistency.
If your Glock 43X/48 is primarily carried IWB or used in more controlled environments, an open emitter optic will serve you just fine. They are lighter, simple, and still perform well in most situations, including light weather. Enclosed designs just add an extra layer of reliability when things get messy.
Maintenance is another factor to consider. Open emitter optics can collect dust, lint, and debris over time, especially with daily carry, so occasional cleaning is part of the routine. Enclosed emitters are easier to maintain since the critical components are protected inside the housing.
To learn more about Open vs Closed emitters you can check out our Open vs Closed Emitter Guide here.
How to decide which Osight reticle style is best for you
In this guide we covered a few different reticle options. If you need some help deciding which is best for you here are some of our thoughts on each.
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6 MOA only (K, SE): Is a more user-friendly option that’s easier to pick up on the draw thanks to its larger size. It sacrifices a bit of long-range precision compared to smaller dots, but it’s still plenty accurate for realistic pistol distances. The bigger dot stays fast, clear, and uncluttered, which is why many shooters prefer a 6 MOA dot over multi-reticle systems for simplicity and speed. |
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MRS Reticle: (32 MOA Ring + 2 MOA Dot: S, SE) This option combines a small center dot with a large 32 MOA outer ring, giving you the best of both worlds. The center dot allows for precise aiming, while the outer ring makes dot acquisition fast and intuitive. The biggest advantage of MRS is flexibility. You can run the dot only, the ring only, or both together, letting you tailor the reticle to your shooting style and stick with what feels best. |
Conclusion
The Glock 43X/48 pistols are excellent slimline options, especially for concealed carry, and adding the right red dot can make an already great setup even better.
Hopefully this guide helped clear up which Osight optics fit the Glock 43X/48 and gave you a better idea of which option makes the most sense for you. Whether you want an enclosed optic, a rechargeable setup, or just a simple budget-friendly red dot, there are a few good options to choose from.
If you’re still not sure which Osight is right for your Glock 43X/48, feel free to reach out to us. We’re always happy to help you figure out fitment and choose the optic that makes the most sense for your setup.
