I've been saving my pennies to do some long repressed gun shopping when I get back to CONUS next Spring. While surfing the internet to refine my shopping list, I learned that the Glock .40s can be converted to .357 Sig with a simple barrel switch and uses the same magazines for both rounds. Likewise, I find that some aftermarket parts manufacturers offer 9mm Luger barrels that will fite in the Glock .40s (not sure about whether the .40 magazines will work with 9mm. In any event, do any of you guys have experience with Glock barrel swaps? I would love to know how these worked out since I would like to get into .40 S&W and .357 Sig, especially with the versatility and economy of a single platform. Having 9mm too would be a bonus.