Strike Industries EMPMPS Enhanced Magazine Plate made of Polymer with Black Finish & Extra Gripping Surface for S&W M&P Shield Magazines (Adds 2rds 9mm Luger, 1rd 40 S&W) Strike's EMP +2 magazine extension increases the capacity of the 9 Shield by 2 rounds and the .40 Shield by 1 round. The molded design integrates seamlessly with the ergonomics, texture and styling of the M&P Shield and conceals well, despite the added length.