Hey Freedom Gorillas, today we are going to cover which Holosun Red & Green dot sights will fit on your Black Rain Ordnance Frontline or Frontline Plus pistol.

I first saw the Frontline at Shot Show 2025 and was very happy Black Rain was getting into the Glock clone game. I know they make quality AR parts, but now seeing them also get into this market made me happy.

They are doing a good job with the frontline, especially giving it a direct RMR cut.

Today the optics we'll be recommending will be red or green dot sights that will fit the RMR cut of the BRO Frontline or Frontline+ models.

Which Holosun Optics do we recommend for the BRO Frontline?

RMR Footprint Optics - these are larger optics with larger windows and more overhang on the slide: Holosun 407C - Best Budget Option Holosun 507C - Best All Around Option Holosun 507C ACSS Vulcan - Best Specialty Option Holosun 507 Comp - Best Competition Option Holosun 508T - Most Durable Open Emitter Holosun 509T - Most Durable Closed Emitter Holosun 509 ACSS Vulcan - Closed Emitter with ACSS Vulcan Reticle Holosun EPS Full Size - Best Closed Emitter Option with Larger Window

 

Quick Nav

• Pistols this article applies to
• Holosun Optics we recommend for the BRO Frontline
• Holosun vs other brands
• What Optics Footprint is the BRO Frontline
• Best RMR Footprint Holosun Optics for the BRO Frontline
  • Holosun 407C - Best Budget Option
  • Holosun 507C - Best All Around Option
  • Holosun 507C ACSS Vulcan - Best Specialty Option
  • Holosun 507 Comp - Largest Window Optic
  • Holosun 508T - Most Durable Open Emitter
  • Holosun 509 ACSS Vulcan - Best Specialty Closed Emitter
  • Holosun 509T - Most Durable Closed Emitter
  • Holosun EPS Full Size - Best Full Size Closed Emitter
• How to choose between red or green reticles
• How to choose between open vs closed emitter
• How to decide which reticle style is best for you
• Conclusion

 

Which BRO Frontline models does this apply to?

This guide will apply to all optics ready Black Rain Ordnance Frontline models

Black Rain Ordnance Frontline Black Rain Ordnance Frontline+

 

Why do we recommend Holosun Optics vs other options?

• They are a good combination of high quality and affordability.
• They have the longest battery life and batteries can be changed without removing the optic.
• They come in red & green reticles with different sizes and styles.
• They are strong with 7075 aluminum or titanium housings and glass.
• They have convenient features like Shake Awake, easy to press brightness buttons, and Side Mounted Batteries.
• Some models have Solar Panels which will power the optic if the battery dies.
• They have a Limited Lifetime Warranty.
• They are reliable, water proof, and have a great track record

 

What optics footprint is the BRO Frontline?

The Black Rain Ordnance frontline has a direct RMR footprint. This means the slide is milled directly for an RMR footprint.

This means it will fit all RMR Footprint Red & Green Dot Sights.

A direct RMR footprint is nice because it will give you more opportunity to view your iron sights, and you don't have to have a multi plate optic system. The less parts the better!

 

Best RMR Footprint Holosun Optics for the BRO Frontline

Below are all the RMR footprint Holosun red & green dot sights that will fit on the Black Rain Frontline. These are larger optics with larger windows and will have some overhang on the slide.

They will mount directly to the slide once you remove the cover plate.

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 Vulcan 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 a very popular option. 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.

 

8. Holosun EPS Full Size Red or Green 6MOA, 2MOA, MRS - Best All Around Closed Emitter

Buy the EPS Full Size At The Best Price

This is one of Holosun's most popular enclosed emitter optics. It has a strong 7075 T6 Aluminum housing. It's lightweight, has a low deck height, IPX8 waterproof ratings, side removable battery, and a long battery life.

These EPS models come in red or green and either a 2MOA, 6MOA, or MRS Reticle. The MRS Reticle has a solar failsafe and auto brightness mode, the others do not.

Read our full EPS Full Size Review here.

 

 

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

The simplest way we can break down open vs closed emitters is to look at how you plan on carrying the pistol. If you plan on being outdoors in the elements with rain, snow, sleet, then a closed emitter will be beneficial.

If you plan on carrying OWB most of the time and plan on being outside then closed emitter would be beneficial.

If you plan on carrying IWB or don't plan on being outside using your red dot in the pouring rain or heavy snow then an open reflex is fine.

Open reflexes will still work in the rain or snow but the closed emitter will give you extra peace of mind.

An open reflex can collect dust and debris on the inside of the reticle over time, so you'll want to clean it out from time to time. An enclosed emitter is easier to clean in this aspect.

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.

	2 MOA only : This dot is quite small which makes it precise. The downside is that it can be hard to “pick up” upon drawing the weapon. If you are experienced shooting red dot sights on pistols then this may not be an issue for you. If you are new, we recommend you practice “finding the dot” at home to become proficient. If you can train your muscle memory to find the dot then 2 MOA is a great choice.
	6 MOA only : This dot is decently larger than the 2 MOA dot. We classify this as more user friendly than the 2 MOA dot as it’s a bit easier to pick up upon drawing. The 6 MOA dot will not be as precise as the 2 MOA dot at long distances (50+ yards) but it is still plenty accurate at all distance ranges. The 6 MOA dot is a nice size and it gives you a less cluttered reticle. Some people prefer it over the MRS.
	MRS Reticle (32 MOA Ring + 2 MOA Dot): This reticle is a good combination of both large and small. You have the 2 MOA dot to be precise with, and the 32 MOA Ring to help “find the dot”. The 32 MOA Circle is quite hard to miss. The nice thing about this reticle is the flexibility. You can use the 32 MOA Ring only or the 2 MOA dot only or both together. This way you can find what you prefer and stick to it.
	ACSS Vulcan with 10 MOA Chevron and 250 MOA Outer Ring : This reticle is going to be the most precise out of all the other options because of it’s Chevron. The tip of the chevron is the most precise aiming point in any red dot reticle. The 250 MOA outer ring is not visible when the chevron is centered, it’s only visible when you need to adjust your aim. This way “finding the dot” becomes quicker. The chevron also gives you range finding capabilities which none of the other optics do. The only shorter battery life compared to other options.
	CRS Reticle (32 MOA Ring, 20 MOA Ring, 8 MOA Ring, 2 MOA Center Dot): The CRS reticle is 7 different reticles in one. It comes with a 32 MOA circle, 20 MOA circle, 8 MOA Circle, and 2 MOA Dot. Holding down the "-" button for 3 seconds lets you toggle through all the reticle options to decide which you like best. You can use The 2 MOA Dot only, one of the circles only, or both the dot and a circle combo together.

 

Conclusion

Thanks for getting this far in the guide. Hopefully by now you have a better understanding of each of the Holosun optics you can fit on your Black Rain Frontline.

You can't go wrong with any of the options, but as you can see, all are different and have their own unique features and benefits.

Luckily there are so many options to choose from, that you should be able to choose a model that fits your exact price point and use case.

If you still need any help or have questions, please reach out to our support team and we will be happy to help.

Thanks for reading and enjoy your Frontline!