I saw a 30-round mag for "S&W 9mm staggered magazines" on the Sportsman's Guide site. I have a Sigma SW9VE. I asked TSG if it would fit. Here is their reply: Dear Kevin, Thank you for your email. Item (WX2-166818 - 30 - rd. Smith & Wesson® 9 mm Mag) is designed for all Smith & Wesson handguns in the 9mm caliber with double stack style magazines (these are also called staggered magazines). So your Sigma (SW9VE) 9mm should work just fine with this item. So, do all S&W Nines use the same mag? (The Sigma is all I've ever had in S&W).