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. Specifications for ZEV Technologies PRO Compact Glock Magwell: Manufacturer: ZEV Technologies Color: Black Finish: Type 3 Anodized Fabric/Material: 6061 Aluminum Gun Make: Glock Gun Model: Glock 19 Gen 5, Glock 23 Gen 5 Model Generation: 5 Additional Features: Compact Models, Will NOT work with Glock Gen 5 G17 Included Accessories: Standard Condition: New Features of ZEV Technologies PRO Compact Glock Magwell The mag-well is slightly flared at the base to be wider than the stock opening, which is ideal for quickly inserting the magazine in the pistol during reloads helping build proper muscle memory for improved consistency and reload time NOTE: Back straps may need to be modified if used. Package Contents: ZEV Technologies PRO Compact Glock Magwell