Here is an extremely simple modification to enable you to shoot your Barret .50 cal like a P90.
UPDATE: Okay, there seems to a problem with certain types of controllers. Apparently there are controllers that use PWM and others are Matrix type. To determine which type yours is, check to see if you have a crystal on your board, as you can see in the bottom right of picture 1. if you have one, your good to go, if you don't, then this mod will not work and the button just acts as another trigger.
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Signing UpStep 1Ingredients
A TT8 Torx Driver
A Small Push Button Switch
Some Thin Wire, Any will do (I used IDE Cable)
An Xbox 360 Controller (Wired or Wireless, it works the same)
Soldering Iron
A Drill and Drill bit (To match the diameter of the thread on your switch)
Some form of surface to work on. (I used a window ledge, I suggest you don't)
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Thanks
This wire in this instructable is really easy to get if you've got any old computer's or old computer parts lying around you can take the Gray IDE ribbon cables apart and use that.
A regular 555 in astable mode should work nicely if you don't have pwm LEDs on your controller.
and mine had the crystal type things too