Hey Freedom Gorillas! Today we’re diving into the best red and green dot sights you can mount on your Beretta A300 Ultima. If you’ve already got one—or it’s on your wish list—you’ve chosen one of the most well-rounded and desirable semi-auto shotguns available today. The Beretta A300 Ultima combines classic Beretta reliability with modern upgrades that make it a powerhouse for hunting, clays, or home defense.
This gas-operated semi-auto shotgun features Beretta’s legendary MobilChoke system, a soft-recoiling Kick-Off stock, enlarged controls for fast manipulation, and smooth cycling with everything from light target loads to heavy game shells. It’s an excellent choice for those who want reliability and versatility all in one shotgun.
And now, with optics-ready models hitting the market, the A300 Ultima makes it easy to mount a red dot right out of the box—perfect for fast target acquisition in the field or at the range.
What models does this guide apply to?
- Beretta A300 Ultima Snow Goose Black Synthetic
- Beretta A300 Ultima Snow Goose Arctic Fox
- Beretta A300 Ultima Competition
- Beretta A300 Ultima Hunting Solid Marsh
- Beretta A300 Ultima Hunting Solid Timber
If you own one of these models, your shotgun will feature an optics cut on top of the receiver with a removable cover plate. Just unscrew this plate, and you’ll be ready to mount a compatible RMR optic.
In this guide, we’ll break down which red dots work with the factory optics cut and what mounting footprint it uses.
Not Optics Ready? No Problem.
If your Beretta A300 Ultima isn’t one of the two optics-ready models listed above, you can likely still mount a red dot—it just takes a little extra hardware. With the right adapter or mount, almost any Mossberg 500 can be upgraded to run an optic. We’ve put together a Universal Shotgun Red Dot Mounting Guide that walks you through all the popular mounting solutions, including picatinny rails, vent rib adapters, and adapter plates.
What optics footprint is the Beretta A300 Ultima?
The Beretta A300 Ultima features an optics ready receiver with an RMR footprint. This means all the Holosun RMR footprint optics will fit directly on the receiver.
Why do we recommend Holosun Optics vs other options?
- They are affordable but not cheap.
- They come in red & green reticles with different sizes and styles.
- They are built sturdily with strong aluminum or titanium housings and glass.
- They have convenient features like Shake Awake and Side Mounted Batteries.
- They have a Limited Lifetime Warranty.
- They are reliable.
- They are waterproof.
- They have a great track record.
When you compare them to other options like Crimson Trace, Viridian, Bushnell, Vortex or others you will find prices are similar but the Holosun has more features, better battery life, a better track record, and better reticles.
Top 7 Beretta A300 Ultima Holosun Optics - Red & Green Dots
1. Holosun 407C Green & Red Dot - Best Budget Option
Buy the 407C At The Best Price
The most budget friendly option is going to be the 407C. The 407C has a 2 MOA dot only. The housing is aluminum.
If you are ok with having just a 2 MOA dot all the time, then the 407C is a great option.
It has shake awake, a side removable battery, solar failsafe with auto brightness or manual brightness modes, 10 daylight and 2 nightvision settings, and is IP67 waterproof.
Read our full 407C review here.
2. Holosun 507C Green & Red Dot - Best All Around Option
Buy the 507C At The Best Price
The Holosun 507C is very similar to the 407C except it has Holosun "MRS" reticle.
It's available in Red or Green reticles and the MRS (Multi Reticle System) lets you use a 32 MOA ring + 2 MOA dot, or it can be toggled to show only the 32 MOA Ring or just the 2 MOA dot by holding down the "-" button for 3 seconds.
It has shake awake, a side removable battery, solar failsafe with auto brightness or manual brightness modes, 10 daylight and 2 nightvision settings, and is IP67 waterproof.
Read our full 507C review here.
3. Holosun 507C ACSS Vulcan Green & Red Dot - Best Specialty Option
Buy the 507C ACSS Vulcan At The Best Price
The 507C ACSS Vulcan may pique your interest. It's just like the 507C except is has the ACSS Vulcan reticle. This reticle features a 250 MOA Ring and a 10 MOA chevron - sounds crazy right? Well it's crazy awesome! It helps new red dot shooter and experts alike, and allows for the most precision out of all optics mentioned here.
You can learn more about the ACSS reticle here but to summarize, the 250 MOA Ring helps you find the center dot quickly if you are off center and the 10 MOA chevron acts like a BDC reticle and also has a very precise point for precision work.
It's available in Red or Green reticles and if you wanted to turn the outside ring off you can by holding down the "-" button for 3 seconds.
It has shake awake, a side removable battery, solar failsafe with auto brightness or manual brightness modes, 10 daylight and 2 nightvision settings, and is IP67 waterproof.
Read our full 507C ACSS review here.
4. Holosun 507 Comp Green & Red Dot - Largest Window Competition Reticle
Buy the 507 Comp At The Best Price
Next on the list is the Holosun 507 Comp. This is one of the newest and most sought after optics from Holosun. Comp stands for "Competition" because this optic features a VERY large window, meant for competition shooting. It's the largest window in the industry.
The 507 Comp has some key differences vs the other optics listed here. First it has the C.R.S. which is the Complete Reticle System. This gives it many reticle configurations like a 2 MOA Dot only or a 2 MOA dot + 8 or 20 or 32 MOA Circle or just a 8 or 20 or 32 MOA Circle.
The 507 Comp also does not have a solar panel on it which means there is also no auto brightness setting.
It has a 7075 aluminum housing, shake awake, a side removable battery, manual brightness modes, 10 daylight and 2 nightvision settings, and is IP67 waterproof.
This is a large optic.
Read our full 507 Comp review here.
5. Holosun 508T Green & Red Dot - Most Durable Open Emitter
Buy the 508T At The Best Price
Next on the list is the Holosun 508T. It's very similar to the 507C except it has a stronger housing made out of titanium and a square window that's a little bigger.
The 508T's square titanium housing is made to give it extra durability, both from the shape and the material.
It's available in Red or Green reticles and they come with Holosun's Multi Reticle System, which is a 32 MOA ring + 2 MOA dot, and can be toggled to show only the 32 MOA Ring or just the 2 MOA dot by holding down the "-" button for 3 seconds.
It has shake awake, a side removable battery, solar failsafe with auto brightness or manual brightness modes, 10 daylight and 2 nightvision settings, and is IP67 waterproof.
Read our full 508T review here.
6. Holosun 509T Green & Red Dot - Most Durable Closed Emitter
Buy the 509T At The Best Price
The 509T is going to be the most heavy duty pistol optic you can buy from Holosun. It's an enclosed emitter and made with a titanium housing. The titanium is not to make it lightweight, it's to make it more durable.
The 509T comes with and RMR adapter plate
The enclosed emitter ensures that nothing can obstruct the view of the emitter and the lens, meaning water, dirt, lint or any other molecule will not get inside the optic. It will also make the optic easier to wipe off if it were to drop in mud or something like that.
The 509T is not going to be the lightest optic, but it will be the toughest.
It also has a nice big FOV and is filled with nitrogen which will help with fog-mitigation, just like a scope.
It's available in Red or Green reticles and they come with Holosun's Multi Reticle System, which is a 32 MOA ring + 2 MOA dot, and can be toggled to show only the 32 MOA Ring or just the 2 MOA dot by holding down the "-" button for 3 seconds.
It has shake awake, a side removable battery, solar failsafe with auto brightness or manual brightness modes, 10 daylight and 2 nightvision settings, and is IP67 waterproof.
Read our full 509T review here.
7. Holosun 509 ACSS Vulcan Red - Best Specialty Closed Emitter
Buy the 509 ACSS Vulcan At The Best Price
Similar to the 509T is the 509 ACSS Vulcan. It is an enclosed emitter optic, but it has two major differences. It’s made out of aluminum and it has the ACSS Reticle (10MOA Chevron + 250 MOA Outer Ring)
This optic is a good option is you need an enclosed emitter and must have the ACSS Reticle.
Choosing between Red or Green Reticles
You may be wondering if you should get a red or green dot reticle. We get this question a lot so I am going to list a few bullet points for you to consider.
- Green reticles are less straining for the eye to see.
- Green reticles can help with astigmatism. If you have astigmatism you will see a blurry dot, we have been told by a few customers that Green dots help with their astigmatism, making the dot look more crisp than the red version.
- Green will not washout 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 For Shotguns
The easiest way to understand the difference between open and closed emitter red dots is to think about how you plan to use your shotgun. If you're going to be outdoors in rough conditions—like rain, snow, or sleet—an enclosed emitter red dot can offer better reliability.
While open emitter (reflex-style) red dots still work in the rain or snow, they have an exposed lens system that can occasionally collect water, mud, or debris. A closed emitter design, on the other hand, keeps the internals sealed—giving you extra peace of mind when you're deep in the woods, out in the blind, or crawling through brush on a turkey hunt.
Dust, leaves, or moisture can settle inside an open emitter if left unchecked, so occasional cleaning is a must. With a closed emitter, cleanup is quicker and easier since both lenses are protected and sealed from the elements.
To learn more about Open vs Closed emitters you can check out our Open vs Closed Emitter Guide here.
How to decide which 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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Conclusion
If your Beretta A300 Ultima is optics ready, it uses a RMR footprint, allowing for direct mounting of select red dots—no adapter needed. If your A300 isn’t optics ready, don’t worry—there are still solid aftermarket mounting options available, you can find those in our Universal Shotgun Mounting Guide.
Not sure if your A300 Ultima is optics ready?
Reach out to our team—send us your model info or a few photos, and we’ll help you figure it out fast.
The Beretta A300 Ultima is a smooth-shooting, reliable semi-auto that blends tradition with modern innovation. Add a red dot, and you’ll take full advantage of everything this shotgun has to offer—whether you’re chasing birds, breaking clays, or securing your home.
