The ZEV Technologies PRO Magwell was designed for the professional shooter that is looking to enhance the look and performance of their Gen5 Glock. The one piece design facilitates easy installation and utilizes a single attachment screw to securely mount to the Glock frame while retaining a low profile. The ZEV PRO Magwell was designed and tested for compatibility with standard capacity factory magazines One piece 6061 aluminum design Type III anodized finish Kit includes magwell body, mounting screw, and wrench. NOTE: Back straps may need to be modified if used. NOTE: Only fits early model Gen 5 G19 frames that have the half moon magwell cut out, and will not fit newer model Gen 5 G19 frames that do not have it.