Yes, the Bushnell Rimfire 3-9x40mm Rifle Scope can be used on an AR platform rifle. I would recommend pairing it with a 1-piece mount such as the Vortex Pro Extended Cantilever Mount (linked below).
https://www.opticsplanet.com/vortex-viper-extended-cantilever-mount.html?_iv_diameter=1-in
The Bushnell Rimfire 3-9x40mm Rifle Scope features a 3 to 9 power zoom.
Bushnell does not state the outside diameter of the objective or eyepiece. I recommend using the scope cover sizing chart on the left side of the product page below to determine what size flip up caps are needed.
https://www.opticsplanet.com/butler-creek-flip-open-scope-covers.html
The Bushnell Rimfire 3-9x40mm Rifle Scope does not include scope rings and will be compatible with 1" scope rings.
The Bushnell Rimfire 3-9x40mm Rifle Scope uses an etched reticle, meaning if the illumination were to die, you will always be able to see the reticle.