Here is a replacement gun magazine for Sig Sauer P220 guns. This is a 45 ACP 8 Round blue steel Promag gun magazine. made from high qual;it heat treated steel and uses Du Pont impact resistant floor plate and an injection molded follower with finger rest for a larger grip area. This magazine features ProMag ANTI-FATIGUE LOAD’UM up and STACK’UM up chrome silicon springs. Leave you mags loaded for years without worry.