Please re-read the information that came with your Wilson magazine.
I bought my Wilson mags when they first came out, I dont remember seeing anything like what you have posted, perhaps they have upgraded since then. I do know that the hardball note was there and thought it was odd, but hey, I figured it was a disclaimer of some sort. I do know that they were finicky in certain pistols as are a lot of other mags, so I use them for practice, like the others that dont feed reliably in my pistols. gyp_c2Is absolutely right, there is only one way to know if a mag will work in your gun, and that is to shoot it. I'm very comfortable with using the military mags in my pistols as they do work in all my 1911's, I know, I've shot all of them in all of my guns. Best of all is the fact that I get 6 mags for the price of 1 Wilson, how can you beat it?