I have a Cabelas VRL-1 Varmint Light mounted on my Savage Mark II TR 22LR. It produces a lot of light and a lot of visibility for roughly 150-200 yards. It comes with 2 batteries (each last several hours), a home and car charger, a green and red bulb, and the necessary hardware to mount it to my scope or rail. It has a pressure button that you can velcro to the side of the rifle and activate the light while aiming.

In the picture below, I used the velcro mount to attach it to my scope. It comes with a ring mount, but I later purchased a mount from Daniel Defense that allowed me to mount it to the side of my scope. I don't have a picture of this new setup, but the velcro worked well, too.

I am really happy with this light and would highly recommend it. It's durable, very bright, and the battery time is long.