The NEW Magblock for XD and XDM Magazines. Unmodified this limiter fits the XDM 9mm 19 round magazines and will convert it to hold only 10 rounds. This block fits into the follower and slides into the spring as shown. Patented design offers Pre-molded levels to fit all other current 9mm and .40 XD and XDM magazines. Even a 15 round option is included. This requires some cutting and filing. Does not affect reliability or magazine function. No increase in spring pressure which would reduce spring life.