Do you use the sling swivel to push the button?
Yes, that is one of my favorite things about this mount - I just slide my hand forward on the handguard and push on the sling swivel which depresses the pushbutton switch on my Surefire G2.
There is a closeup photo of this on Elzetta’s website:
http://www.elzetta.com/Webpages/pushbutton_activation.htm