The Strike Industries Aluminum Extended Magazine Plate for GLOCK™ G17 (9mm) / G22 (.40 cal) was designed to provide smoother magazine reloading through a slow drag / no snag design while maintaining maximum magazine capacity. Machined from 6061-T6 aluminum, this Extended Magazine Plate (EMP) adds plus 5 9mm or plus 4 .40 cal rounds to compatible OEM double stack GLOCK™ magazines. Following the success of our EMP systems for pistols, the form factor and unique geometric design gives a unified and aggressive aesthetic look to your GLOCK™ G17. Included is an aluminum plate which adds extra locking security. Give your GLOCK™ pistol the extra rounds it deserves with the Strike Industries Aluminum Extended Magazine Plate (EMP) for GLOCK™ G17 (9mm).