Top performer, middle price - Streamlight ProTac Rail Mount HL-X Pro Long Range 1000 Lumens Gun Light w/Remote Switch

For the money, you get everything, pressure pad, pressure pad attachment, multiple rail attachments for the light, click button if you want it.

The only thing to be aware of, is the mlock attachment is designed for slim rails and tucks it in nicely on slim round handrails. But if you have an rectangular rail like on an AK or MCX you need a pic rail or another aftermarket mlok attachment.