If you're in the market for a full size 22lr optics ready pistol then chances are you are looking at the Sig Sauer P322 or have already acquired one. With a threaded barrel, optics ready slide, 20rd magazine, and street price a little above $400, and the Sig brand name it's an attractive choice.
If you're looking for a list of red dots that are compatible with the P322 and which we personally recommend then you've come to the right place.
*The Sig P322 uses the Shield RMSc footprint - so any red dot that fits that footprint will fit the P322. We won't list every sight that fits that footprint - only what we carry and recommend.
Here are the top 4 red dots we recommend for your Sig P322. These will fit directly onto the P322 without any modification.
1. Holosun 407K X2
The Holosun 407K X2 is our best seller. It's the most affordable Holosun micro red dot sight. It has a 6 MOA dot, Shake Awake technology, a 7075 aluminum housing, side battery for easy replacement, numerous brightness settings including 2 for night vision, and touts a 50,000 hr battery life.
It's easy to install and comes with Holosun's 3 year warranty.
2. Holosun 507K X2
The Holosun 507K X2 is another great option. It has the exact same specs as the 407K X2 except it has a different reticle. The 507K X2 has a 32 MOA Circle with 2 MOA Dot. It's a pretty cool reticle, some people say the larger circle makes it easier to find when drawing the pistol.
Another cool feature is you can toggle the reticle. So you can use the 32 MOA Circle plus the 2 MOA Dot or you can show only the 32 MOA Circle or you can show only the 2 MOA Dot.
One thing to note is that when using the 32 MOA Circle and 2 MOA Dot combo reticle, battery life is rated at 20,000 hrs instead of 50,000.
The 507K X2 is also more expensive than the 407K X2.
3 & 4. Holosun 407K GR X2 & Holosun 507K GR X2
Holosun also makes the 407K & 507K with Green Dot Reticles. The specs are the same as their red dot counterpart, the only difference is instead of a "Red" colored reticle they have a "Green" reticle. The Green versions are a little more expensive than their red counterparts but if you like a green reticle they are a great choice.
I've looked at the green and red dot sights personally and I like both. The green is cool, they say it's easier to see, I personally don't have any issues seeing green or red. But if you are looking for something a little more vibrant and also "cool" then the green dot sights are worth taking a look at.
5. Holosun 507K ACSS Vulcan Green & Red Dot
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.
6. Holosun EPS Carry - Closed Emitter Option
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
There are 3 versions of the EPS Carry.
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.
BONUS: How To Install The 407k/507k On To The P322
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.
We hope you found this guide helpful and informative. You can't go wrong with any of the optics listed here.
If you have any questions please reach out to us on chat.
Thank you for reading!