Buying an optic can get complicated fast. You start looking for a red dot, and suddenly, you’re comparing LPVOs, prism optics, holographic sights, reticles, magnification, and mounts, all offering different ways to get more out of your firearm.
The hard part is knowing which features will actually matter when you use it.
Trijicon, Aimpoint, EOTECH, Vortex, Leupold, and other major brands offer plenty of choices across these categories. At RKB Armory, we buy and sell used firearm optics from many of these brands, so we see firsthand how much the right choice depends on the firearm, intended use, and features that matter to the buyer.
This guide breaks down the major types of modern firearm optics, how they differ, and the features that separate one option from another.
What Separates One Type of Optic From Another
Two optics can look similar on the shelf and perform very differently once they’re mounted. Here’s a closer look at how the major categories work and what distinguishes each one.
Here is a simple place to start:
- Red dot and reflex sights keep things simple when speed and a clear aiming point are priorities.
- Holographic sights offer fast target acquisition with a different reticle and optical design than traditional red dots.
- LPVOs give you adjustable magnification for setups that need to handle both closer and more distant targets.
- Magnified rifle scopes make more sense when distance, target visibility, and precision are the priorities.
- Prism optics offer a compact design and etched reticle, with magnification and illumination options depending on the model.
You will also run into terms like MOA, MRAD, co-witness, eye relief, and BDC as you compare models. Those details matter, but they are much easier to understand once you know which category fits what you want from the optic.
The Main Types of Firearm Optics
Two optics can look similar on the shelf and perform very differently once they’re mounted. Understanding what separates the main categories can help you narrow the field before comparing individual models, features, and prices.
Red Dot / Reflex Sights
Red dot and reflex sights use an LED to create an illuminated aiming point and typically provide no magnification. Their simple sight picture makes them popular for handguns and rifles, where quick target acquisition is a priority.
Holographic Sights
Holographic sights serve a similar purpose but use a different optical system to create the reticle. They are commonly paired with compatible magnifiers, although they are typically larger and can use more battery power than many red dots.
LPVOs (Low Power Variable Optics)
LPVOs combine low magnification, often starting around 1x, with the ability to increase magnification when needed. Common ranges include 1-6x, 1-8x, and 1-10x, making them an option for firearm owners seeking greater flexibility from a single optic.
Magnified Rifle Scopes
Traditional rifle scopes prioritize magnification and target visibility at greater distances. With options ranging from familiar 3-9x scopes to considerably higher magnification, they remain common for hunting, target shooting, and other applications where distance matters more than close-range speed.
Prism Optics
Prism optics use a prism-based optical system and typically feature an etched reticle that remains visible even when illumination is turned off. They are available in different magnifications and compact configurations, making them another option for firearm owners who want something between a traditional red dot and a larger variable scope.
RKB Armory’s used optics inventory includes different optic types and brands, giving buyers the opportunity to compare pre-owned options based on the features that matter for their setup rather than choosing on brand recognition alone.
How Mounting Changes Between Optic Types
Different optic types also come with different mounting considerations. Red dots and prism optics may use dedicated mounts or footprints, while LPVOs and traditional rifle scopes typically require rings or a compatible scope mount.
Mounting height, eye relief, and co-witness can also matter depending on the optic and firearm. Before buying, make sure the optic’s mounting system works with your setup rather than assuming every option attaches or positions the same way.
Features That Can Change the Experience
Even within the same optic category, features can vary considerably. Magnification range affects how much flexibility an optic provides at different distances, while reticle design changes the information you see through the optic.
Size, weight, illumination, battery requirements, eye relief, and adjustment systems can also differ between models. Comparing these features can help explain why two red dots, LPVOs, or rifle scopes in the same category may feel very different in actual use.
Price can reflect differences in construction, optical quality, features, and specifications, but a higher price does not automatically make an optic the right fit for every firearm or application.
Compare Condition Along With Features
Once you’ve narrowed down the type of optic you want, check its overall condition and function. Look for issues with the lenses, adjustments, mounting hardware, and illumination that could affect how the optic performs.
With used optics, a little cosmetic wear may be expected. What matters is whether the important components are in good working condition and accurately represented before you buy.
At RKB Armory, we inspect the used firearm optics we sell so you have a clearer picture of what you’re getting. Once you know what fits your firearm, intended use, and budget, choosing from all those options becomes a lot easier.
Frequently Asked Questions
Q: What’s the difference between a red dot and a holographic sight?
A: A red dot typically uses an LED reflected off a lens, while a holographic sight uses a laser-based system to create the reticle. Both are designed for fast target acquisition but differ in design, battery use, and other features.
Q: What is an LPVO?
A: An LPVO, or Low-Power Variable Optic, is a variable-magnification scope that typically starts around 1x and increases to 4x, 6x, 8x, 10x, or more, depending on the model.
Q: What’s the difference between a prism optic and a red dot?
A: A prism optic uses a prism-based optical system and typically has an etched reticle. A red dot uses an illuminated aiming point and generally provides no magnification.
Q: What does MOA vs. MRAD mean?
A: MOA and MRAD are angular measurement systems used for scope adjustments and reticles. Neither is inherently better, so consistency between your reticle, turrets, and preferred system is usually more important.
Q: Is it worth buying a used optic?
A: It can be. A properly inspected used optic may offer access to higher-end models at a lower price, but condition, function, features, and age should all be considered.
See What’s in Stock
Ready to narrow down your options? Browse RKB Armory’s used optic inventory to find your next optic at a price that fits your budget.
Have an optic you’re ready to move on from? You can also sell your optic to RKB Armory.
