https://www.burrisoptics.com/sights/fastfire-red-dot-sights/fastfire-4

FastFire™ 4
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Instant dot-on-target accuracy for any firearm from handgun to shotgun. A great choice for 3-Gun and wing shooting, and any use from patrol to plinking. Multiple reticle options, massive battery life and 4 different models make FastFire 4 the most versatile red dot reflex you can mount.

Everything you loved about the FastFire 3 plus...

Toggle between four different reticle options
Larger sight window for faster target acquisition
Longer battery life - up to 26k hours on medium brightness
Brighter aiming point
Optional screw-on weather shield for a completely enclosed sight
Auto-Brightness & Auto-shutoff after 8 hours
Lightweight at 1.6 oz

MSRP: $419