The first option is you can buy a Xbox 360 controller with the MOD already installed off of eBay.
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The second option is if you already have a Xbox 360 controller you can pay someone to install it for you on eBay. You will see plenty of these listings when you do your search for Dual Rapid Fire MOD, and all you have to do is just send your controller to them and they take care of the rest.
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The third option is if you already have a Xbox 360 controller you can buy just the equipment for the MOD on eBay and install it yourself. I wouldn't attempt this unless you are good with electronics.
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Read more: How to Dual Rapid Fire MOD Your Xbox 360 Controller | eHow.com
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