Personally I've never gone out and tried it, but it depends what type of gun she is.
If she's a shooter girl, dancer etc. ask her to "switch off the customer mode, I want to talk to the real you" then later in the conversation verify that you're still in that mode with a tease, something like "I bet you say that to every guy you talk to" - get her to qualify herself to you.
As said before i've never personally done it but there's a great episode in Series 1 of 'The Pickup Artist' - Episode 7 when they go to a strip club, worth checking out.
In addition this may be helpful to you
http://www.bristollair.com/2011/outer-g ... ired-guns/
*Credit to Tyler Durden*