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I had a FastFire III (8 moa) laying around not doing anything, so I decided to mount it on my Mossberg 500 hunting shotgun.

On last week's duck hunt, that combination proved to be a real duck slayer. With both eyes open (as you should always do) I could focus entirely on the bird, shoulder the gun and wait for the red dot to hit the bird before tickling the trigger. Since it auto adjusts it's brightness, I didn't have to touch it after turning it on. I'm very pleased with this setup.

I think the FastFire III would be ideal for any home defense long gun or pistol.