The Shield Arms G19ME5BLK is a Glock 19/23 Magazine Extension that enhances your Glock 19 magazine with an added capacity of 5 rounds, and your Glock 23 magazine with an additional 4 rounds. What sets Shield Arm\'s product apart is its distinctive, user-friendly floor plate design. This allows rapid access to the spring and follower, eliminating the need to disengage the extension from the magazine body.