Hello! Looking for advise.
 

My first post...
I recently bought a Buckmaster G2XL for my son from a local shop here in Alabama second hand and it has a W3 draw module on it now but I think its at least 2 inches too long for him. Could anyone tell me where to find a chart that explains what module yields desired lengths? Please tell me where to purchase? I think he needs a W5 or W6 but I don't really know for sure.

From my experience working in a shop I can confirm your thoughts. Bear seems to be the only one that marks their modules backwards. For 2" you do need a w5. You can also get another inch or so by loosening the bolt/nut in the peg that both ends of the string attach to. Then it can be slid either way to change the draw. This is a really nice feature for fine tuning the draw length.

Good info. I thank you. COuld you tell me where to buy one?

I would start by checking Bear's website for a dealer near you. Any dealer should have some modules. One of the box stores such as Bass Pro or Gander Mt. should have some. I used to work at a Gander store and we had gobs of them. Barring that a call to Bear's customer service might set you up.