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Best Springfield Hellcat Holosun Red Dot Sights, Adapter Plates, and How to Mount Them

Best Hellcat Optics

The Springfield Armory Hellcat OSP, RDP, & PRO variants are some of the most popular subcompact pistols out there. If you own one or are thinking of purchasing one, you are probably wondering which Red Dot or Green Dot optics fit it and how to fit it on the gun.

We will give you our top recommendations and also how to mount them - because it can be tricky - so keep reading.

What footprint is the Springfield Hellcat OSP, RDP, & PRO? 

Hellcat RMSC Footprint

The Springfield Hellcat OSP, RDP,  & PRO all have an RMSc footprint. This means there are four recoil lugs. The optics we recommend are the the Holosun 407K507K, and EPS Carry  They have two recoil lugs on the front only.

To mount these you need an adapter plate or you have to modify your slide. Which we will explain more below. 

You can learn more about Holosun's "modified RMSc footprint" here.

Why do we recommend the Holosun Optics vs other options?

  • They are affordable but not cheap. 
  • They are built sturdily with strong aluminum 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.

When you compare them to other options like Crimson Trace, Bushnell, or others you will find prices are similar but the other options do not have as good of a track record and do not have as many features.

How do you mount a Holosun 407K/507K or EPS Carry to a Springfield Hellcat OSP, RDP, or PRO?

There are two options to mount the Holosun optics to your Hellcat.

1. Buy an adapter plate.

You can buy a Hellcat Adapter Plate which will give you everything you need to mount a Holosun K Series footprint optic to your Hellcat OSP, RDP, or PRO. These plates act like a shim which gives you the correct footprint. They also comes with the proper screws.

Calculated Kinetics Hellcat to 407K/507K/EPS Carry Adapter Plate

    CHPWS Hellcat to 407K/507K    CHPWS Hellcat to EPS Adapter Plate   

    2.  Modify your slide (at your own risk)

    The second option is to modify your slide. You can do this by grinding down the rear recoil lugs and possibly the front ones a bit. We have heard this could void your warranty but aren't sure, and we don't recommend doing this, but if you did feel comfortable doing it - have at it!

    Here is a video that shows someone doing it on their Hellcat so you can get an idea of what to do and how much is involved.

    Top 4 Holosun Red & Green Dots we recommend for the Springfield Hellcat OSP, RDP, & PRO

    In our opinion these are the best bang for your buck optics for your Springfield Hellcat OSP, RDP, and PRO. Just make sure you read and understand the information above on how to mount them first.

    1. Holosun 407K. Most Budget Friendly Option.

    The 407K is an affordable optic. It's lightweight, made out of aluminum, and has really nice controls.


    • 6 MOA dot
    • Shake Awake
    • 50,000 Hr Battery Life
    • Removable Side Battery
    • IP67 Waterproof
    • 10 Daylight Brightness Settings and 2 Night Vision
    • Aluminum Housing

    The 6 MOA dot is a great size for a pistol. 

    You can get this optic in Red or Green Dot Versions.

    Read our full 407K review here.

    Buy the 407K At The Best Price

    2. Holosun 507K. The Next Step Up.

    MRS how to toggle

    This optic is exactly like the 407K except it has Holosun’s famous MRS reticle which is a 32 MOA circle and 2 Moa dot. 


    • MRS Reticle - 32 MOA Circle + 2 MOA Dot
    • Shake Awake
    • 50,000 Hr Battery Life
    • Removable Side Battery
    • IP67 Waterproof
    • 10 Daylight Brightness Settings and 2 Night Vision
    • Aluminum Housing

    The MRS reticle can be toggled by hitting the “-“ button. So you can use the 32 MOA circle plus 2 MOA dot, just the 2 MOA dot, or just the 32 MOA circle. 

    The 507K is available in both red and green reticles. 

    Read our full 507K review here.

    Buy the 507K At The Best Price

    3. Holosun EPS Carry - Closed Emitter Option

    EPS Carry MRS

    Pro Tip: The RMSc Adapter plate that comes with the EPS Carry will allow you to install the EPS Carry on your Hellcat without having to purchase an additional adapter plate. However the screws that come with the EPS carry are too long, therefore you would need to purchase these screws instead.

    The EPS Carry is very similar to the 407K and 507K except it has one major difference, it is an enclosed emitter optic.  

    This means the laser emitter is protected by a hood. So dirt, mud, or debris will never get in the way of the emitter to distort the reticle. 


    • MRS Reticle or 2 MOA Reticle or 6 MOA Reticle 
    • Shake Awake
    • 50,000 Hr Battery Life
    • Removable Side Battery
    • IPX8 Waterproof
    • 8 Daylight Brightness Settings and 4 Night Vision
    • Aluminum Housing
    • Enclosed Emitter

    The EPS Carry comes in red or green reticles.

    There are 3 versions of the EPS Carry. 

    A 2 MOA Dot, 6 MOA Dot, and MRS version.

    The MRS version has a solar panel on it which acts as a solar fail safe to power the reticle of the battery dies. It also gives you an extra auto brightness feature which can be toggled on or off. 

    Read our full EPS Carry review here.

    Buy the EPS Carry At The Best Price

    4. Holosun 507K ACSS Vulcan Green & Red Dot

    Holosun 507K ACSS Vulcan

    Buy the 507K ACSS Vulcan At The Best Price

    The 507K ACSS Vulcan is exactly like the 507K except is has the ACSS Vulcan reticle. This reticle has a 230 MOA dotted outer ring and a 3 MOA center dot.

    The purpose of this reticle is to help you find the center dot quickly if you are off center. To learn more about the ACSS Vulcan check out our article here.

    The dotted outer ring can be turned off by holding down the "-" button for 3 seconds.

    The main advantage of the ACSS Vulcan reticle is to be able to find the center dot quickly when drawing the pistol.

    All the features are the same as the 507K except for the reticle, and this is available in both red & green.

    Read our full 507K ACSS 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 (EPS Carry 2 MOA): 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 (407KEPS Carry 6 MOA): 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) (507K, EPS Carry MRS: 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 3 MOA Dot and 230 MOA Dotted Outer Ring (507K ACSS Vulcan): This reticle is going to have a 3 moa dot and the 230 MOA dotted outer ring. The outer ring is only visible when the dot is not centered. The purpose is to help you find the dot quicker upon drawing the weapon. The 3 MOA dot give you a slightly larger dot than the 2 MOA dot, but it’s not that noticeable. The real value to this reticle is the outer ring and it’s assistance with helping you get on target faster by quickly adjusting your grip to “find the dot”


    All of these optics are fantastic for your Springfield Hellcat OSP, RDP, or PRO. You won’t find a better combination of quality and affordability. 

    Each optic also has it’s unique features and benefits. I wouldn’t say one is better than the other. 

    The 407K’s 6 MOA dot is really nice and some people prefer it over the MRS Reticle. The MRS reticle is larger which makes it easier to pick up when drawing. The EPS Carry is super cool because of the enclosed emitter.

    If you have any questions, reach out to us on chat or leave a comment!

    Thanks for reading!

    comment 1 comment

    Randall Wood calendar_today

    Very helpful information that is clear and concise !

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