.375" Basepad Square Hole for Sig Sauer P320 by Springer Precision
 
Although there is a round hole on the outside of this base pad there is a square notch on the inside. 
 
Springer Precision extended basepads for Sig Sauer P320 9/40 are CNC machined from aluminum and hard anodized. This lengthens the magazine .375" to make for easier, more reliable magazine changes. They also allow you to use a magwell without adding capacity to the magazines. They are perfect for IDPA ESP and USPSA. Perfect for use with Sig P320 X5 with or without the factory magwell.
 
.76 OZ 
 
New magazines have a square-style locking floortab/basepad. These base pads are made for that style. Although there is a round hole on the outside of this base pad there is a square notch on the inside. Please see las pic in the gallery above. 
Not for the 21rd 9mm/18rd .40 factory mags, please see SP0218 for a basepad for those mags
Not compatible with flanges that fold into the magazine body (P250, P320 Subcompact 12rd)
 
Due to design variations, Springer Precision cannot guarantee compatibility with any other manufacturer’s aftermarket magwell, unless otherwise specified.