Thanks for some entertaining reading guys, but I've got to admit that when I saw 19 responses, I figured SOMEONE out there might have had the opportunity to actually try sticking a Walther magazine in a SW99. I did see the magazine review comment though - closest to an answer to my original question.
By the way, the name-calling got a little tiresome. For what its worth, I also believe that Walther makes the frames of both guns (numerous sources), and that most of the DESIGN differences are cosmetic. But that doesn't mean that the fit and finish are necessarily equal. Maybe Walther makes a better quality slide and barrel than the Smith. Or maybe not. I can't say.
At any rate, I ordered 3 high capacity Walther magazines the other day, so if they won't work in the SW99, I guess my decision is made. Thanks again.
By the way, the name-calling got a little tiresome. For what its worth, I also believe that Walther makes the frames of both guns (numerous sources), and that most of the DESIGN differences are cosmetic. But that doesn't mean that the fit and finish are necessarily equal. Maybe Walther makes a better quality slide and barrel than the Smith. Or maybe not. I can't say.
At any rate, I ordered 3 high capacity Walther magazines the other day, so if they won't work in the SW99, I guess my decision is made. Thanks again.