In this guide, let's check out some of the 10 best large window red dot sight for pistol use.

These are large field of view optics designed to provide extra room for the shooter to find the dot when presenting the gun, and widen situational awareness and negate minor shooter's aiming error. We have tested these products in airsoft training and on the live firing range to find what we like and don't like.

Large Window Red Dot Sight

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Trijicon SRO - Best Overall

Overall Window Size: 1X24mm

fn509 trijicon sro pov in action

Why we picked this one - The SRO fits on any slide with an RMR cut. If you want a pistol red dot sight with the biggest view, choose the Trijicon SRO.

Same RMR mounting footprint - Using the exact Trijicon RMR mounting footprint keeps everything compatible without having to buy special accessories.

Not Lose The Dot - Find the dot quickly and steadily, even if you're a bit off-center when presenting the pistol fast. Also reacquire the dot much faster after each follow-up shots

Automatic Mode - Improved brightness control system to lock the mode for conceal carry

Various Dot Sizes - Choose from 1 MOA to 6.5 MOA. 6.5 MOA is highly recommended for pistol use

Top Battery Access - Load/Replace battery right from the top! No sight removal or re-zero required

Read Trijicon SRO Detailed Review

Trijicon RMR HD - 3rd Gen RMR

Overall Window Size: ~1X25mm

rmr hd

The Trijicon RMR® HD is a new red dot pistol sight made for the police and the military. It's built from the earlier Trijicon RMR® Adjustable LED sight. This is putting RMR and SRO together.

Durable RMR Style Lens Frame - Unlike the SRO, the RMR HD has a tougher lens frame now for duty use.

User Friendly Buttons - Easily dial the buttons with bare hands or wearing glvoes

Auto Reticle Adjustment - This sensor checks the light where you're aiming and changes the red dot's brightness for you. You can also pick different patterns for the red dot. Some patterns are bright for daytime, and others work with night vision.

Dot Or Circle - The user can adjust the reticle style to have an unclutter center dot or with a reticle ring

The Trijicon RMR HD is what the Trijicon SRO could have been, and now it's here that.

Leupold DeltaPoint Pro - Best Durability

Overall Window Size: ~1X25.7mm

deltapoint pro parallax

The DeltaPoint Pro has similar FOV size as the Trijicon SRO but in a retangular shape with extra hood protection. This is Leupold's best selling micro red dot sight for pistol and rifle use.

Larger Window Than RMR - The first well known handgun optic in the market with a large window for faster target acquisition speed.

Extra Housing Protection - Lens hood protects the main optic glass frame from direct impact to increase the durability  

Easier Battery Access - Load/Replace battery right from the top

6 MOA - 6 MOA dot size is now available for pistol applications. Works better for shooters with astigmatism

Swampfox Liberty - Unique FOV Design

Overall Window Size: ~1X27mm

swampfox liberty vs justice

Why we picked this one - The Swampfox Liberty uses the same RMR footprint to fit on any existing RMR optic cut. The FOV gets bigger on top without increase the base width of the optic.

Track The Dot Better - Wide 1X27mm FOV helps dot tracking within the window.

Skeletonized Body - Weight reduction and fits most optic ready holsters including ALS series duty holsters

Shake Awake - IMotion sensor activates the optic reticle when in motion (Even just a small tap)

Top Loading Battery - Same user friendly design as the Trijicon SRO

Sig ROMEO3 MAX - Unique FOV Design

Overall Window Size: 1X30mm

The Sig ROMEO 3 MAX 1X30mm is an product in direct competition to the Trijicon SRO around the same time they were released. 

This open reflex optic is designed for competition (influenced by Max Michel) use that features similar large circular window like the SRO.

The run time is about 20K hours (uses CR2032 battery) shorter than the Trijicon SRO, but the rest of the optic features similar specs.

As far as for users with astigmatism who want bigger dot sizes, the 6 MOA dot size is a better option.


Trijicon MRO - No Tube Effect

Overall Window Size: 1X25mm

Trijicon MRO on CZ Scorpion

Why Get The MRO - The MRO is as strong as the Aimpoint Micro, but with bigger field of view at a cheaper price point. It accepts all types of aftermarket mounts to make it work on your gun.

Reduced View Obstruction - No view obstruction on the sides due to turret or brightness adjustment knobs. It's also ergonomical for lefties and righties.

Reduced Tube Effect - The tapered body design allows the tube to remain small while giving the shooter a wide view.

Battle Proven Durability - The 7075 T6 aluminum body survives rough handling, drops, recoils and kicks

Holosun 510C - Best For The Money

Overall Window Size: ~1X32mm

holosun 510c pov
HoloSun 510C is low drag and low weight open emitter reflex sight for PCC and rifles. It's reasonable price tag makes it a great option for beginner or intermediate users.


Find Target Fast - It's very helpful when shooting on the move or transitioning with both eyes open thanks to the large viewing window that doesn't obstruct shooter's view.

Flexible Head Movement - Parallax free reticle stays on target accurately even if the shooter's eye shifts off center horizontally or vertically.

Versatile Reticle System - Use the 65 MOA reticle circle for range estimation

Holosun AEMS - Unique FOV Design

Overall Window Size: 1X28mm

holosun aems red dot sight

The AEMS is Holosun's newest large window enclosed emitter red dot sight (IPX7 rated). In many ways, this product will set the new standard for Holosun rifle and PCC red dot sights.

Smaller Profile - AEMS is small and almost look like an Holosun 509T for PDW type rifle setup

Lens Cover - Included both front and back see through lens cover

7075 T6 Construction - Built with materials stronger than the standard 6061 T6 aluminum

Motion Sensor - It features the same MOTAC system as many Holosun products

Green or Red Reticle - Pick the reticle color you like

CQB Ring Reticle - 2 MOA center dot with the option to turn on the 65 MOA ring for range estimation and mechanical offset

Steiner R1X  - Unique FOV Design

Overall Window Size: 1X32mm

steiner r1x reflex sight

The Steiner R1X is one of a kind red dot sight that's compact and beefy looking. The R1X reduces the “tunnel vision” of hard-focus iron sights for quicker target acquisition, enhanced accuracy and greater situational awareness.

Holosun 507C ACSS - Best Assisted Dot Tracking

Overall Window Size: 1X23mm

holosun 507c acss reticle slow motion

The Holosun 507C ACSS has a window size close to the Trijicon RMR. Its ACSS Vulcan reticle is made to help shooters spot the reticle quickly without making the window bigger.

The whole point of a big window red dot sight is to have wider field of view and to track the dot better. The ACSS Vulcan reticle is an unique design worth checking out