The Shield Arms G19ME5RED is a magazine extension designed specifically for the Glock 19 and Glock 23. It grants an additional 5 rounds for your Glock 19 magazine, while the Glock 23 magazine gets an extra 4 rounds boost.What sets this product apart is Shield Arm\'s distinctive, easily accessible floor plate design. This feature permits fast and trouble-free access to the spring and follower, all without the requirement to disassemble the extension from the magazine body.