Agency Arms Extended Magazine Release Glock Gen4 Left Hand Black. It features a serrated and enlarged face that is 3/64" longer than the standard magazine release. Machined from 6061 Aluminum and MIL-A-8625 Type 3 Hard Anodized. Aluminum and MIL-A-8625 Type 3 Hard Anodized. Right Hand Orientation. Will not fit wide frames or single stack frames. Specifications for Agency Arms Extended Magazine Release Glock Gen4: Manufacturer: Agency Arms Gun Make: Glock Model Generation: 4 Color: Black Fabric/Material: 6061 Aluminum Features of Agency Arms Extended Magazine Release Glock Gen4: Direct replacement part enlarged serrated pad extended by 3/64" Machined from 6061 and MIL-A-8625 Type 3 Hard Anodized Package Contents: Agency Arms Extended Magazine Release Glock Gen4 Agency Arms 25MR-G4LH-B: Extended Magazine Release Glock Gen4 Left Hand Black