It looks like the sight was designed for a rail on a handgun, but I am using it on an AR 15 .223 as a close quarters primary or backup for my 3X illuminated prism sight, and it seems to work well in that role.
The sight was easy to mount on the upper handguard rail where I can easily turn it on or off with my thumb (or finger if I wrapped my hand around the fore-end a bit more to use the other switch) - switches on both sides extend behind the body of the sight. The switches are on or off without a momentary on option. My unit would not turn on or off unless I pressed the center-forward portion of the switch, so if you plan to use this for defensive purposes, you want to make sure you know where to press. The upper, rear, and lower portions of the switch didn't work for me.
It is short enough (1" above the rail) that the prism sight looks above it, and I can't see the laser at all in the sight. It is
about 1.3" wide and 2.5" long including the switches on the rear.
It is tall enough that you can use a very low offset mount in front of it for a light (laser about .40-.45" above the rail).
Fortunately, my prism sight was sighted in for 100 yds, and it was quick and easy to move the laser to match the prism sight near dusk when you can see the laser at 100 yds. It might be much more time consuming (and ammo consuming) if you didn't have your iron sights or optic already sighted in. As an fyi, there are no "clicks" or gradations, and a barely perceptible movement of the...
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