Of the mag pouches I've tried over the years, this is my favorite and the only one I will recommend to anyone competing with the large frame pistols. Also works for Caspian magazines. I use 4 with my setup. Fits belts 1.5" (38mm).

• Right-hand shooters: Order Right-hand Pouch
  (Right-hand pouch is worn on Left Side of body)
• Left-hand shooters: Order Left-hand Pouch
  (Left-hand pouch is worn on Right Side of body)
• Fully adjustable for rake and tensionNow availabe for both large and small frame models / magazines.
  

Large Frame mags measure 1.345" x 0.850" (34mm x 21.5mm) fits:
US Market: All EAA Witness models sold since mid 1990's.
Outside US: Tanfoglio 38 Super, 40S&W, 10mm and 45 ACP.
Also Fits: Caspian Hi-Cap Mags !

Small Frame mags measure 1.250" x 0.800" (32mm x 20.5mm) fits:
US Market: Springfield P9's, EAA Witness models sold prior to mid 1990's.
Outside US: All Tanfoglio 9mm models. Production Stock II !
Also Fits: A wide variety of doiuble stack 9mm magazines such as Beretta, Browning 9mm, Heckler &  Koch, Ruger, Sig Sauer, Smith & Wesson, Springfield, Taurus.