Enhanced Magazine Plate Extension for S&W M&P Shield 9 & 40 +1/ 2 RoundThis listed magazine extension is for S&W M&P 9 and . 40 Shield. The Enhanced Magazine Plate 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, beyond the added length, which increases your firepower and ergonomics. Features 9mm: Plus 2 round capacity 40 S&W: Plus 1 round capacity Extended grip surface