I bought a X forged 7 iron. Wanted to have one to try before I buy a complete set. I was very disappointed though. I loved the 7 iron and the feel of the 7 iron. My disappointment is that I received the club and it was assembled in Monterry, Mexico. I thought that all the irons were assembled in Carlsbad CA. I was not happy to find that out.
I think there is only one company that makes clubs in the US and that is Ping. I also think, but am not sure by any means, that assembled Callaway clubs come out of Texas.
When I worked for Las Vegas Golf & Tennis we took numerous tours and meetings with golf manufacturers and the question of why the clubs were made in China inevitably came up. The answer was always the same. Even knowing the clubs would be counterfeited along with intellectual property and actual product stolent, it was still less expensive to manufacture clubs in China rather than America. Is that due to a hostile business climate? Smarter minds than mine can probably answer that one.
I wouldn't lose any sleep over it. I think it's a great compromise having the clubs built in Mexico. Callaway is close enough to keep an eye on their facility and to ensure everything is going according to their preferences and product tolerances.
Almost every manufacturer has their components built overseas and then assembled over the border as well. Any Callaway club you order, if different than stock, will be assembled in Mexico and then shipped to you. If you buy the club in the stock configuration then it will be shipped out of the U.S... but my guess is that it was priorly assembled in Mexico.